Finding the Fourth Proportional to 139,393.55, 209,007.28 and 55,165.68

Step by Step Solution

1. Step 1: Write the proportion equation
   139,393.55 : 209,007.28 = 55,165.68 : x
2. Step 2: Convert to fraction form
   139,393.55/209,007.28 = 55,165.68/x
3. Step 3: Cross multiply
   139,393.55x = 209,007.28 × 55,165.68
4. Step 4: Simplify right side
   139,393.55x = 11,530,028,726.15
5. Step 5: Solve for x
   x = 11,530,028,726.15/139,393.55
6. Step 6: Final answer
   x = 82,715.65