Finding the Third Proportional to 142,387.50 and 313,197

Step by Step Solution

1. Step 1: Write the proportion equation
   142,387.50 : 313,197 = 313,197 : x
2. Step 2: Convert to fraction form
   142,387.50/313,197 = 313,197/x
3. Step 3: Cross multiply
   142,387.50x = 313,197 × 313,197
4. Step 4: Simplify right side
   142,387.50x = 98,092,360,809
5. Step 5: Solve for x
   x = 98,092,360,809/142,387.50
6. Step 6: Final answer
   x = 688,911.32