Finding the Fourth Proportional to 72,197.76, 99,629.98 and 39,930.25

Step by Step Solution

1. Step 1: Write the proportion equation
   72,197.76 : 99,629.98 = 39,930.25 : x
2. Step 2: Convert to fraction form
   72,197.76/99,629.98 = 39,930.25/x
3. Step 3: Cross multiply
   72,197.76x = 99,629.98 × 39,930.25
4. Step 4: Simplify right side
   72,197.76x = 3,978,250,008.90
5. Step 5: Solve for x
   x = 3,978,250,008.90/72,197.76
6. Step 6: Final answer
   x = 55,102.13