Finding the Fourth Proportional to 71,899.12, 99,255.90 and 55,729.96

Step by Step Solution

1. Step 1: Write the proportion equation
   71,899.12 : 99,255.90 = 55,729.96 : x
2. Step 2: Convert to fraction form
   71,899.12/99,255.90 = 55,729.96/x
3. Step 3: Cross multiply
   71,899.12x = 99,255.90 × 55,729.96
4. Step 4: Simplify right side
   71,899.12x = 5,531,527,336.76
5. Step 5: Solve for x
   x = 5,531,527,336.76/71,899.12
6. Step 6: Final answer
   x = 76,934.56