Finding the Fourth Proportional to 99,439.78, 137,233.02 and 57,004.69

Step by Step Solution

1. Step 1: Write the proportion equation
   99,439.78 : 137,233.02 = 57,004.69 : x
2. Step 2: Convert to fraction form
   99,439.78/137,233.02 = 57,004.69/x
3. Step 3: Cross multiply
   99,439.78x = 137,233.02 × 57,004.69
4. Step 4: Simplify right side
   99,439.78x = 7,822,925,762.86
5. Step 5: Solve for x
   x = 7,822,925,762.86/99,439.78
6. Step 6: Final answer
   x = 78,669.98