Finding the Fourth Proportional to 144,969.72, 217,517.15 and 78,456.78

Step by Step Solution

1. Step 1: Write the proportion equation
   144,969.72 : 217,517.15 = 78,456.78 : x
2. Step 2: Convert to fraction form
   144,969.72/217,517.15 = 78,456.78/x
3. Step 3: Cross multiply
   144,969.72x = 217,517.15 × 78,456.78
4. Step 4: Simplify right side
   144,969.72x = 17,065,695,183.78
5. Step 5: Solve for x
   x = 17,065,695,183.78/144,969.72
6. Step 6: Final answer
   x = 117,719.03