Finding the Fourth Proportional to 89,728.40, 123,830.72 and 49,442.15

Step by Step Solution

1. Step 1: Write the proportion equation
   89,728.40 : 123,830.72 = 49,442.15 : x
2. Step 2: Convert to fraction form
   89,728.40/123,830.72 = 49,442.15/x
3. Step 3: Cross multiply
   89,728.40x = 123,830.72 × 49,442.15
4. Step 4: Simplify right side
   89,728.40x = 6,122,457,032.85
5. Step 5: Solve for x
   x = 6,122,457,032.85/89,728.40
6. Step 6: Final answer
   x = 68,233.21