Finding the Fourth Proportional to 112,819.92, 155,671.72 and 64,399.72

Step by Step Solution

1. Step 1: Write the proportion equation
   112,819.92 : 155,671.72 = 64,399.72 : x
2. Step 2: Convert to fraction form
   112,819.92/155,671.72 = 64,399.72/x
3. Step 3: Cross multiply
   112,819.92x = 155,671.72 × 64,399.72
4. Step 4: Simplify right side
   112,819.92x = 10,025,215,179.92
5. Step 5: Solve for x
   x = 10,025,215,179.92/112,819.92
6. Step 6: Final answer
   x = 88,860.33