Finding the Fourth Proportional to 72,431.76, 108,678.86 and 39,175.25

Step by Step Solution

1. Step 1: Write the proportion equation
   72,431.76 : 108,678.86 = 39,175.25 : x
2. Step 2: Convert to fraction form
   72,431.76/108,678.86 = 39,175.25/x
3. Step 3: Cross multiply
   72,431.76x = 108,678.86 × 39,175.25
4. Step 4: Simplify right side
   72,431.76x = 4,257,520,917.85
5. Step 5: Solve for x
   x = 4,257,520,917.85/72,431.76
6. Step 6: Final answer
   x = 58,779.75