Finding the Fourth Proportional to 99,983.38, 137,978.72 and 59,700.66

Step by Step Solution

1. Step 1: Write the proportion equation
   99,983.38 : 137,978.72 = 59,700.66 : x
2. Step 2: Convert to fraction form
   99,983.38/137,978.72 = 59,700.66/x
3. Step 3: Cross multiply
   99,983.38x = 137,978.72 × 59,700.66
4. Step 4: Simplify right side
   99,983.38x = 8,237,420,649.96
5. Step 5: Solve for x
   x = 8,237,420,649.96/99,983.38
6. Step 6: Final answer
   x = 82,387.90