Finding the Fourth Proportional to 117,003.75, 161,524.92 and 81,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   117,003.75 : 161,524.92 = 81,131.50 : x
2. Step 2: Convert to fraction form
   117,003.75/161,524.92 = 81,131.50/x
3. Step 3: Cross multiply
   117,003.75x = 161,524.92 × 81,131.50
4. Step 4: Simplify right side
   117,003.75x = 13,104,759,046.98
5. Step 5: Solve for x
   x = 13,104,759,046.98/117,003.75
6. Step 6: Final answer
   x = 112,002.90