Finding the Fourth Proportional to 287,697.72, 431,530.85 and 88,018.10

Step by Step Solution

1. Step 1: Write the proportion equation
   287,697.72 : 431,530.85 = 88,018.10 : x
2. Step 2: Convert to fraction form
   287,697.72/431,530.85 = 88,018.10/x
3. Step 3: Cross multiply
   287,697.72x = 431,530.85 × 88,018.10
4. Step 4: Simplify right side
   287,697.72x = 37,982,522,910.64
5. Step 5: Solve for x
   x = 37,982,522,910.64/287,697.72
6. Step 6: Final answer
   x = 132,022.33