Finding the Third Proportional to 321,505.50 and 698,361

Step by Step Solution

1. Step 1: Write the proportion equation
   321,505.50 : 698,361 = 698,361 : x
2. Step 2: Convert to fraction form
   321,505.50/698,361 = 698,361/x
3. Step 3: Cross multiply
   321,505.50x = 698,361 × 698,361
4. Step 4: Simplify right side
   321,505.50x = 487,708,086,321
5. Step 5: Solve for x
   x = 487,708,086,321/321,505.50
6. Step 6: Final answer
   x = 1,516,950.99