Finding the Fourth Proportional to 90,880.92, 136,109.77 and 87,728.00

Step by Step Solution

1. Step 1: Write the proportion equation
   90,880.92 : 136,109.77 = 87,728.00 : x
2. Step 2: Convert to fraction form
   90,880.92/136,109.77 = 87,728.00/x
3. Step 3: Cross multiply
   90,880.92x = 136,109.77 × 87,728.00
4. Step 4: Simplify right side
   90,880.92x = 11,940,637,002.69
5. Step 5: Solve for x
   x = 11,940,637,002.69/90,880.92
6. Step 6: Final answer
   x = 131,387.72