Finding the Fourth Proportional to 287,844.98, 431,788.23 and 88,139.42

Step by Step Solution

1. Step 1: Write the proportion equation
   287,844.98 : 431,788.23 = 88,139.42 : x
2. Step 2: Convert to fraction form
   287,844.98/431,788.23 = 88,139.42/x
3. Step 3: Cross multiply
   287,844.98x = 431,788.23 × 88,139.42
4. Step 4: Simplify right side
   287,844.98x = 38,057,564,155.03
5. Step 5: Solve for x
   x = 38,057,564,155.03/287,844.98
6. Step 6: Final answer
   x = 132,215.49