Finding the Fourth Proportional to 112,385.76, 155,096.80 and 64,639.04

Step by Step Solution

1. Step 1: Write the proportion equation
   112,385.76 : 155,096.80 = 64,639.04 : x
2. Step 2: Convert to fraction form
   112,385.76/155,096.80 = 64,639.04/x
3. Step 3: Cross multiply
   112,385.76x = 155,096.80 × 64,639.04
4. Step 4: Simplify right side
   112,385.76x = 10,025,308,259.07
5. Step 5: Solve for x
   x = 10,025,308,259.07/112,385.76
6. Step 6: Final answer
   x = 89,204.44