Finding the Fourth Proportional to 108,691.72, 150,007.07 and 72,391.16

Step by Step Solution

1. Step 1: Write the proportion equation
   108,691.72 : 150,007.07 = 72,391.16 : x
2. Step 2: Convert to fraction form
   108,691.72/150,007.07 = 72,391.16/x
3. Step 3: Cross multiply
   108,691.72x = 150,007.07 × 72,391.16
4. Step 4: Simplify right side
   108,691.72x = 10,859,185,443.55
5. Step 5: Solve for x
   x = 10,859,185,443.55/108,691.72
6. Step 6: Final answer
   x = 99,908.12