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Finding the Fourth Proportional to 8,957.80, 12,361.81 and 4,979.28

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Solution

The fourth proportional to 8,957.80, 12,361.81 and 4,979.28 is: 6,871.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,957.80 : 12,361.81 = 4,979.28 : x
  2. Step 2: Convert to fraction form
    8,957.80/12,361.81 = 4,979.28/x
  3. Step 3: Cross multiply
    8,957.80x = 12,361.81 × 4,979.28
  4. Step 4: Simplify right side
    8,957.80x = 61,552,900.85
  5. Step 5: Solve for x
    x = 61,552,900.85/8,957.80
  6. Step 6: Final answer
    x = 6,871.43

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