Finding the Fourth Proportional to 287,919.30, 431,911.35 and 88,238.10

Step by Step Solution

1. Step 1: Write the proportion equation
   287,919.30 : 431,911.35 = 88,238.10 : x
2. Step 2: Convert to fraction form
   287,919.30/431,911.35 = 88,238.10/x
3. Step 3: Cross multiply
   287,919.30x = 431,911.35 × 88,238.10
4. Step 4: Simplify right side
   287,919.30x = 38,111,036,892.44
5. Step 5: Solve for x
   x = 38,111,036,892.44/287,919.30
6. Step 6: Final answer
   x = 132,367.08