Finding the Fourth Proportional to 116,991.72, 161,437.80 and 71,649

Step by Step Solution

1. Step 1: Write the proportion equation
   116,991.72 : 161,437.80 = 71,649 : x
2. Step 2: Convert to fraction form
   116,991.72/161,437.80 = 71,649/x
3. Step 3: Cross multiply
   116,991.72x = 161,437.80 × 71,649
4. Step 4: Simplify right side
   116,991.72x = 11,566,856,932.20
5. Step 5: Solve for x
   x = 11,566,856,932.20/116,991.72
6. Step 6: Final answer
   x = 98,869.02