Finding the Fourth Proportional to 81,791.19, 112,957.89 and 72,875.57

Step by Step Solution

1. Step 1: Write the proportion equation
   81,791.19 : 112,957.89 = 72,875.57 : x
2. Step 2: Convert to fraction form
   81,791.19/112,957.89 = 72,875.57/x
3. Step 3: Cross multiply
   81,791.19x = 112,957.89 × 72,875.57
4. Step 4: Simplify right side
   81,791.19x = 8,231,870,683.52
5. Step 5: Solve for x
   x = 8,231,870,683.52/81,791.19
6. Step 6: Final answer
   x = 100,644.96