Finding the Fourth Proportional to 72,520.56, 108,679.60 and 39,168.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72,520.56 : 108,679.60 = 39,168.76 : x
2. Step 2: Convert to fraction form
   72,520.56/108,679.60 = 39,168.76/x
3. Step 3: Cross multiply
   72,520.56x = 108,679.60 × 39,168.76
4. Step 4: Simplify right side
   72,520.56x = 4,256,845,169.30
5. Step 5: Solve for x
   x = 4,256,845,169.30/72,520.56
6. Step 6: Final answer
   x = 58,698.46