Finding the Fourth Proportional to 71,971.86, 99,320.88 and 39,708.53

Step by Step Solution

1. Step 1: Write the proportion equation
   71,971.86 : 99,320.88 = 39,708.53 : x
2. Step 2: Convert to fraction form
   71,971.86/99,320.88 = 39,708.53/x
3. Step 3: Cross multiply
   71,971.86x = 99,320.88 × 39,708.53
4. Step 4: Simplify right side
   71,971.86x = 3,943,886,167.86
5. Step 5: Solve for x
   x = 3,943,886,167.86/71,971.86
6. Step 6: Final answer
   x = 54,797.61