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Finding the Fourth Proportional to 8,122.97, 12,189.47 and 3,191.74

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Solution

The fourth proportional to 8,122.97, 12,189.47 and 3,191.74 is: 4,789.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,122.97 : 12,189.47 = 3,191.74 : x
  2. Step 2: Convert to fraction form
    8,122.97/12,189.47 = 3,191.74/x
  3. Step 3: Cross multiply
    8,122.97x = 12,189.47 × 3,191.74
  4. Step 4: Simplify right side
    8,122.97x = 38,905,618.98
  5. Step 5: Solve for x
    x = 38,905,618.98/8,122.97
  6. Step 6: Final answer
    x = 4,789.58

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