Finding the Fourth Proportional to 99,200.89, 136,898.22 and 53,879.30

Step by Step Solution

1. Step 1: Write the proportion equation
   99,200.89 : 136,898.22 = 53,879.30 : x
2. Step 2: Convert to fraction form
   99,200.89/136,898.22 = 53,879.30/x
3. Step 3: Cross multiply
   99,200.89x = 136,898.22 × 53,879.30
4. Step 4: Simplify right side
   99,200.89x = 7,375,980,264.85
5. Step 5: Solve for x
   x = 7,375,980,264.85/99,200.89
6. Step 6: Final answer
   x = 74,353.97