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Finding the Fourth Proportional to 8,931.72, 12,326.10 and 6,689.64

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Solution

The fourth proportional to 8,931.72, 12,326.10 and 6,689.64 is: 9,231.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,931.72 : 12,326.10 = 6,689.64 : x
  2. Step 2: Convert to fraction form
    8,931.72/12,326.10 = 6,689.64/x
  3. Step 3: Cross multiply
    8,931.72x = 12,326.10 × 6,689.64
  4. Step 4: Simplify right side
    8,931.72x = 82,457,171.60
  5. Step 5: Solve for x
    x = 82,457,171.60/8,931.72
  6. Step 6: Final answer
    x = 9,231.95

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