Finding the Fourth Proportional to 89,439.88, 123,419 and 49,153.20

Step by Step Solution

1. Step 1: Write the proportion equation
   89,439.88 : 123,419 = 49,153.20 : x
2. Step 2: Convert to fraction form
   89,439.88/123,419 = 49,153.20/x
3. Step 3: Cross multiply
   89,439.88x = 123,419 × 49,153.20
4. Step 4: Simplify right side
   89,439.88x = 6,066,438,790.80
5. Step 5: Solve for x
   x = 6,066,438,790.80/89,439.88
6. Step 6: Final answer
   x = 67,827.00