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Finding the Fourth Proportional to 42,840.60, 64,282.86 and 20,672.88

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Solution

The fourth proportional to 42,840.60, 64,282.86 and 20,672.88 is: 31,019.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,840.60 : 64,282.86 = 20,672.88 : x
  2. Step 2: Convert to fraction form
    42,840.60/64,282.86 = 20,672.88/x
  3. Step 3: Cross multiply
    42,840.60x = 64,282.86 × 20,672.88
  4. Step 4: Simplify right side
    42,840.60x = 1,328,911,850.84
  5. Step 5: Solve for x
    x = 1,328,911,850.84/42,840.60
  6. Step 6: Final answer
    x = 31,019.92

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