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Finding the Fourth Proportional to 42,690.36, 64,021.72 and 14,219.76

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Solution

The fourth proportional to 42,690.36, 64,021.72 and 14,219.76 is: 21,325.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,690.36 : 64,021.72 = 14,219.76 : x
  2. Step 2: Convert to fraction form
    42,690.36/64,021.72 = 14,219.76/x
  3. Step 3: Cross multiply
    42,690.36x = 64,021.72 × 14,219.76
  4. Step 4: Simplify right side
    42,690.36x = 910,373,493.19
  5. Step 5: Solve for x
    x = 910,373,493.19/42,690.36
  6. Step 6: Final answer
    x = 21,325.04

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