Finding the Third Proportional to 144,142.66 and 315,434.88

Step by Step Solution

1. Step 1: Write the proportion equation
   144,142.66 : 315,434.88 = 315,434.88 : x
2. Step 2: Convert to fraction form
   144,142.66/315,434.88 = 315,434.88/x
3. Step 3: Cross multiply
   144,142.66x = 315,434.88 × 315,434.88
4. Step 4: Simplify right side
   144,142.66x = 99,499,165,294.94
5. Step 5: Solve for x
   x = 99,499,165,294.94/144,142.66
6. Step 6: Final answer
   x = 690,282.55