Finding the Third Proportional to 144,292.50 and 316,290.38

Step by Step Solution

1. Step 1: Write the proportion equation
   144,292.50 : 316,290.38 = 316,290.38 : x
2. Step 2: Convert to fraction form
   144,292.50/316,290.38 = 316,290.38/x
3. Step 3: Cross multiply
   144,292.50x = 316,290.38 × 316,290.38
4. Step 4: Simplify right side
   144,292.50x = 100,039,601,317.64
5. Step 5: Solve for x
   x = 100,039,601,317.64/144,292.50
6. Step 6: Final answer
   x = 693,311.17