Finding the Fourth Proportional to 144,170.88, 215,162.72 and 140,438.40

Step by Step Solution

1. Step 1: Write the proportion equation
   144,170.88 : 215,162.72 = 140,438.40 : x
2. Step 2: Convert to fraction form
   144,170.88/215,162.72 = 140,438.40/x
3. Step 3: Cross multiply
   144,170.88x = 215,162.72 × 140,438.40
4. Step 4: Simplify right side
   144,170.88x = 30,217,108,136.45
5. Step 5: Solve for x
   x = 30,217,108,136.45/144,170.88
6. Step 6: Final answer
   x = 209,592.31