Finding the Fourth Proportional to 72,639.92, 108,981.76 and 25,886.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,639.92 : 108,981.76 = 25,886.72 : x
2. Step 2: Convert to fraction form
   72,639.92/108,981.76 = 25,886.72/x
3. Step 3: Cross multiply
   72,639.92x = 108,981.76 × 25,886.72
4. Step 4: Simplify right side
   72,639.92x = 2,821,180,306.23
5. Step 5: Solve for x
   x = 2,821,180,306.23/72,639.92
6. Step 6: Final answer
   x = 38,837.88