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Finding the Fourth Proportional to 18,877.86, 28,317.42 and 8,489.64

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Solution

The fourth proportional to 18,877.86, 28,317.42 and 8,489.64 is: 12,734.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,877.86 : 28,317.42 = 8,489.64 : x
  2. Step 2: Convert to fraction form
    18,877.86/28,317.42 = 8,489.64/x
  3. Step 3: Cross multiply
    18,877.86x = 28,317.42 × 8,489.64
  4. Step 4: Simplify right side
    18,877.86x = 240,404,701.53
  5. Step 5: Solve for x
    x = 240,404,701.53/18,877.86
  6. Step 6: Final answer
    x = 12,734.74

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