Finding the Fourth Proportional to 108,985.72, 150,418.12 and 90,807.60

Step by Step Solution

1. Step 1: Write the proportion equation
   108,985.72 : 150,418.12 = 90,807.60 : x
2. Step 2: Convert to fraction form
   108,985.72/150,418.12 = 90,807.60/x
3. Step 3: Cross multiply
   108,985.72x = 150,418.12 × 90,807.60
4. Step 4: Simplify right side
   108,985.72x = 13,659,108,473.71
5. Step 5: Solve for x
   x = 13,659,108,473.71/108,985.72
6. Step 6: Final answer
   x = 125,329.34