Finding the Fourth Proportional to 131,815.89, 181,905.03 and 71,385.12

Step by Step Solution

1. Step 1: Write the proportion equation
   131,815.89 : 181,905.03 = 71,385.12 : x
2. Step 2: Convert to fraction form
   131,815.89/181,905.03 = 71,385.12/x
3. Step 3: Cross multiply
   131,815.89x = 181,905.03 × 71,385.12
4. Step 4: Simplify right side
   131,815.89x = 12,985,312,395.15
5. Step 5: Solve for x
   x = 12,985,312,395.15/131,815.89
6. Step 6: Final answer
   x = 98,510.98