Finding the Fourth Proportional to 112,385.02, 155,096.03 and 64,638.40

Step by Step Solution

1. Step 1: Write the proportion equation
   112,385.02 : 155,096.03 = 64,638.40 : x
2. Step 2: Convert to fraction form
   112,385.02/155,096.03 = 64,638.40/x
3. Step 3: Cross multiply
   112,385.02x = 155,096.03 × 64,638.40
4. Step 4: Simplify right side
   112,385.02x = 10,025,159,225.55
5. Step 5: Solve for x
   x = 10,025,159,225.55/112,385.02
6. Step 6: Final answer
   x = 89,203.70