Finding the Third Proportional to 140,086.13 and 309,612.38

Step by Step Solution

1. Step 1: Write the proportion equation
   140,086.13 : 309,612.38 = 309,612.38 : x
2. Step 2: Convert to fraction form
   140,086.13/309,612.38 = 309,612.38/x
3. Step 3: Cross multiply
   140,086.13x = 309,612.38 × 309,612.38
4. Step 4: Simplify right side
   140,086.13x = 95,859,822,753.14
5. Step 5: Solve for x
   x = 95,859,822,753.14/140,086.13
6. Step 6: Final answer
   x = 684,292.06