Finding the Third Proportional to 147,109.50 and 318,600

Step by Step Solution

1. Step 1: Write the proportion equation
   147,109.50 : 318,600 = 318,600 : x
2. Step 2: Convert to fraction form
   147,109.50/318,600 = 318,600/x
3. Step 3: Cross multiply
   147,109.50x = 318,600 × 318,600
4. Step 4: Simplify right side
   147,109.50x = 101,505,960,000
5. Step 5: Solve for x
   x = 101,505,960,000/147,109.50
6. Step 6: Final answer
   x = 690,002.75