Finding the Third Proportional to 147,088.50 and 317,505

Step by Step Solution

1. Step 1: Write the proportion equation
   147,088.50 : 317,505 = 317,505 : x
2. Step 2: Convert to fraction form
   147,088.50/317,505 = 317,505/x
3. Step 3: Cross multiply
   147,088.50x = 317,505 × 317,505
4. Step 4: Simplify right side
   147,088.50x = 100,809,425,025
5. Step 5: Solve for x
   x = 100,809,425,025/147,088.50
6. Step 6: Final answer
   x = 685,365.78