Finding the Fourth Proportional to 71,761.61, 99,017.60 and 39,930.50

Step by Step Solution

1. Step 1: Write the proportion equation
   71,761.61 : 99,017.60 = 39,930.50 : x
2. Step 2: Convert to fraction form
   71,761.61/99,017.60 = 39,930.50/x
3. Step 3: Cross multiply
   71,761.61x = 99,017.60 × 39,930.50
4. Step 4: Simplify right side
   71,761.61x = 3,953,821,582.06
5. Step 5: Solve for x
   x = 3,953,821,582.06/71,761.61
6. Step 6: Final answer
   x = 55,096.62