Finding the Fourth Proportional to 112,389.72, 155,102.31 and 64,643.04

Step by Step Solution

1. Step 1: Write the proportion equation
   112,389.72 : 155,102.31 = 64,643.04 : x
2. Step 2: Convert to fraction form
   112,389.72/155,102.31 = 64,643.04/x
3. Step 3: Cross multiply
   112,389.72x = 155,102.31 × 64,643.04
4. Step 4: Simplify right side
   112,389.72x = 10,026,284,829.42
5. Step 5: Solve for x
   x = 10,026,284,829.42/112,389.72
6. Step 6: Final answer
   x = 89,209.98