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Finding the Fourth Proportional to 21,956, 30,299.28 and 12,020

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Solution

The fourth proportional to 21,956, 30,299.28 and 12,020 is: 16,587.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,956 : 30,299.28 = 12,020 : x
  2. Step 2: Convert to fraction form
    21,956/30,299.28 = 12,020/x
  3. Step 3: Cross multiply
    21,956x = 30,299.28 × 12,020
  4. Step 4: Simplify right side
    21,956x = 364,197,345.60
  5. Step 5: Solve for x
    x = 364,197,345.60/21,956
  6. Step 6: Final answer
    x = 16,587.60

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