Finding the Third Proportional to 147,892.50 and 318,681

Step by Step Solution

1. Step 1: Write the proportion equation
   147,892.50 : 318,681 = 318,681 : x
2. Step 2: Convert to fraction form
   147,892.50/318,681 = 318,681/x
3. Step 3: Cross multiply
   147,892.50x = 318,681 × 318,681
4. Step 4: Simplify right side
   147,892.50x = 101,557,579,761
5. Step 5: Solve for x
   x = 101,557,579,761/147,892.50
6. Step 6: Final answer
   x = 686,698.65