Finding the Fourth Proportional to 287,698.72, 431,532.35 and 88,019.09

Step by Step Solution

1. Step 1: Write the proportion equation
   287,698.72 : 431,532.35 = 88,019.09 : x
2. Step 2: Convert to fraction form
   287,698.72/431,532.35 = 88,019.09/x
3. Step 3: Cross multiply
   287,698.72x = 431,532.35 × 88,019.09
4. Step 4: Simplify right side
   287,698.72x = 37,983,084,752.56
5. Step 5: Solve for x
   x = 37,983,084,752.56/287,698.72
6. Step 6: Final answer
   x = 132,023.82