Finding the Fourth Proportional to 287,682.31, 431,507.93 and 88,002.72

Step by Step Solution

1. Step 1: Write the proportion equation
   287,682.31 : 431,507.93 = 88,002.72 : x
2. Step 2: Convert to fraction form
   287,682.31/431,507.93 = 88,002.72/x
3. Step 3: Cross multiply
   287,682.31x = 431,507.93 × 88,002.72
4. Step 4: Simplify right side
   287,682.31x = 37,973,871,541.57
5. Step 5: Solve for x
   x = 37,973,871,541.57/287,682.31
6. Step 6: Final answer
   x = 131,999.33