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Finding the Fourth Proportional to 1,318,889.15, 1,978,296.63 and 420,384.74

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Solution

The fourth proportional to 1,318,889.15, 1,978,296.63 and 420,384.74 is: 630,565.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,889.15 : 1,978,296.63 = 420,384.74 : x
  2. Step 2: Convert to fraction form
    1,318,889.15/1,978,296.63 = 420,384.74/x
  3. Step 3: Cross multiply
    1,318,889.15x = 1,978,296.63 × 420,384.74
  4. Step 4: Simplify right side
    1,318,889.15x = 831,645,714,445.43
  5. Step 5: Solve for x
    x = 831,645,714,445.43/1,318,889.15
  6. Step 6: Final answer
    x = 630,565.29

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