Finding the Third Proportional to 698,672.50 and 988,821

Step by Step Solution

1. Step 1: Write the proportion equation
   698,672.50 : 988,821 = 988,821 : x
2. Step 2: Convert to fraction form
   698,672.50/988,821 = 988,821/x
3. Step 3: Cross multiply
   698,672.50x = 988,821 × 988,821
4. Step 4: Simplify right side
   698,672.50x = 977,766,970,041
5. Step 5: Solve for x
   x = 977,766,970,041/698,672.50
6. Step 6: Final answer
   x = 1,399,463.94