Finding the Fourth Proportional to 90,881.92, 136,111.27 and 87,729

Step by Step Solution

1. Step 1: Write the proportion equation
   90,881.92 : 136,111.27 = 87,729 : x
2. Step 2: Convert to fraction form
   90,881.92/136,111.27 = 87,729/x
3. Step 3: Cross multiply
   90,881.92x = 136,111.27 × 87,729
4. Step 4: Simplify right side
   90,881.92x = 11,940,905,605.83
5. Step 5: Solve for x
   x = 11,940,905,605.83/90,881.92
6. Step 6: Final answer
   x = 131,389.23