Finding the Fourth Proportional to 99,212.18, 136,833.59 and 65,255.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,212.18 : 136,833.59 = 65,255.50 : x
2. Step 2: Convert to fraction form
   99,212.18/136,833.59 = 65,255.50/x
3. Step 3: Cross multiply
   99,212.18x = 136,833.59 × 65,255.50
4. Step 4: Simplify right side
   99,212.18x = 8,929,143,321.80
5. Step 5: Solve for x
   x = 8,929,143,321.80/99,212.18
6. Step 6: Final answer
   x = 90,000.47