Finding the Fourth Proportional to 287,696.72, 431,529.35 and 88,017.09

Step by Step Solution

1. Step 1: Write the proportion equation
   287,696.72 : 431,529.35 = 88,017.09 : x
2. Step 2: Convert to fraction form
   287,696.72/431,529.35 = 88,017.09/x
3. Step 3: Cross multiply
   287,696.72x = 431,529.35 × 88,017.09
4. Step 4: Simplify right side
   287,696.72x = 37,981,957,636.59
5. Step 5: Solve for x
   x = 37,981,957,636.59/287,696.72
6. Step 6: Final answer
   x = 132,020.82