Finding the Third Proportional to 142,891.50 and 314,940

Step by Step Solution

1. Step 1: Write the proportion equation
   142,891.50 : 314,940 = 314,940 : x
2. Step 2: Convert to fraction form
   142,891.50/314,940 = 314,940/x
3. Step 3: Cross multiply
   142,891.50x = 314,940 × 314,940
4. Step 4: Simplify right side
   142,891.50x = 99,187,203,600
5. Step 5: Solve for x
   x = 99,187,203,600/142,891.50
6. Step 6: Final answer
   x = 694,143.48