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Finding the Fourth Proportional to 31,821.56, 47,728.60 and 8,449.80

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Solution

The fourth proportional to 31,821.56, 47,728.60 and 8,449.80 is: 12,673.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,821.56 : 47,728.60 = 8,449.80 : x
  2. Step 2: Convert to fraction form
    31,821.56/47,728.60 = 8,449.80/x
  3. Step 3: Cross multiply
    31,821.56x = 47,728.60 × 8,449.80
  4. Step 4: Simplify right side
    31,821.56x = 403,297,124.28
  5. Step 5: Solve for x
    x = 403,297,124.28/31,821.56
  6. Step 6: Final answer
    x = 12,673.71

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