Finding the Third Proportional to 686,539.50 and 998,643

Step by Step Solution

1. Step 1: Write the proportion equation
   686,539.50 : 998,643 = 998,643 : x
2. Step 2: Convert to fraction form
   686,539.50/998,643 = 998,643/x
3. Step 3: Cross multiply
   686,539.50x = 998,643 × 998,643
4. Step 4: Simplify right side
   686,539.50x = 997,287,841,449
5. Step 5: Solve for x
   x = 997,287,841,449/686,539.50
6. Step 6: Final answer
   x = 1,452,629.95