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Finding the Fourth Proportional to 7,931.40, 11,897.10 and 5,713.80

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Solution

The fourth proportional to 7,931.40, 11,897.10 and 5,713.80 is: 8,570.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,931.40 : 11,897.10 = 5,713.80 : x
  2. Step 2: Convert to fraction form
    7,931.40/11,897.10 = 5,713.80/x
  3. Step 3: Cross multiply
    7,931.40x = 11,897.10 × 5,713.80
  4. Step 4: Simplify right side
    7,931.40x = 67,977,649.98
  5. Step 5: Solve for x
    x = 67,977,649.98/7,931.40
  6. Step 6: Final answer
    x = 8,570.70

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