Finding the Fourth Proportional to 71,818.46, 99,121.32 and 54,790.54

Step by Step Solution

1. Step 1: Write the proportion equation
   71,818.46 : 99,121.32 = 54,790.54 : x
2. Step 2: Convert to fraction form
   71,818.46/99,121.32 = 54,790.54/x
3. Step 3: Cross multiply
   71,818.46x = 99,121.32 × 54,790.54
4. Step 4: Simplify right side
   71,818.46x = 5,430,910,648.31
5. Step 5: Solve for x
   x = 5,430,910,648.31/71,818.46
6. Step 6: Final answer
   x = 75,619.98