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Finding the Fourth Proportional to 30,985.61, 42,759.90 and 16,838.55

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Solution

The fourth proportional to 30,985.61, 42,759.90 and 16,838.55 is: 23,237.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,985.61 : 42,759.90 = 16,838.55 : x
  2. Step 2: Convert to fraction form
    30,985.61/42,759.90 = 16,838.55/x
  3. Step 3: Cross multiply
    30,985.61x = 42,759.90 × 16,838.55
  4. Step 4: Simplify right side
    30,985.61x = 720,014,714.15
  5. Step 5: Solve for x
    x = 720,014,714.15/30,985.61
  6. Step 6: Final answer
    x = 23,237.07

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