Finding the Third Proportional to 142,087.50 and 313,821

Step by Step Solution

1. Step 1: Write the proportion equation
   142,087.50 : 313,821 = 313,821 : x
2. Step 2: Convert to fraction form
   142,087.50/313,821 = 313,821/x
3. Step 3: Cross multiply
   142,087.50x = 313,821 × 313,821
4. Step 4: Simplify right side
   142,087.50x = 98,483,620,041
5. Step 5: Solve for x
   x = 98,483,620,041/142,087.50
6. Step 6: Final answer
   x = 693,119.52