Finding the Fourth Proportional to 131,087.52, 180,907.92 and 99,200.16

Step by Step Solution

1. Step 1: Write the proportion equation
   131,087.52 : 180,907.92 = 99,200.16 : x
2. Step 2: Convert to fraction form
   131,087.52/180,907.92 = 99,200.16/x
3. Step 3: Cross multiply
   131,087.52x = 180,907.92 × 99,200.16
4. Step 4: Simplify right side
   131,087.52x = 17,946,094,609.27
5. Step 5: Solve for x
   x = 17,946,094,609.27/131,087.52
6. Step 6: Final answer
   x = 136,901.63