Finding the Fourth Proportional to 144,817.28, 217,089.72 and 78,157.52

Step by Step Solution

1. Step 1: Write the proportion equation
   144,817.28 : 217,089.72 = 78,157.52 : x
2. Step 2: Convert to fraction form
   144,817.28/217,089.72 = 78,157.52/x
3. Step 3: Cross multiply
   144,817.28x = 217,089.72 × 78,157.52
4. Step 4: Simplify right side
   144,817.28x = 16,967,194,132.69
5. Step 5: Solve for x
   x = 16,967,194,132.69/144,817.28
6. Step 6: Final answer
   x = 117,162.77