Finding the Fourth Proportional to 144,970.09, 217,517.72 and 78,457.15

Step by Step Solution

1. Step 1: Write the proportion equation
   144,970.09 : 217,517.72 = 78,457.15 : x
2. Step 2: Convert to fraction form
   144,970.09/217,517.72 = 78,457.15/x
3. Step 3: Cross multiply
   144,970.09x = 217,517.72 × 78,457.15
4. Step 4: Simplify right side
   144,970.09x = 17,065,820,385.70
5. Step 5: Solve for x
   x = 17,065,820,385.70/144,970.09
6. Step 6: Final answer
   x = 117,719.60