Finding the Third Proportional to 691,217 and 988,441.50

Step by Step Solution

1. Step 1: Write the proportion equation
   691,217 : 988,441.50 = 988,441.50 : x
2. Step 2: Convert to fraction form
   691,217/988,441.50 = 988,441.50/x
3. Step 3: Cross multiply
   691,217x = 988,441.50 × 988,441.50
4. Step 4: Simplify right side
   691,217x = 977,016,598,922.25
5. Step 5: Solve for x
   x = 977,016,598,922.25/691,217
6. Step 6: Final answer
   x = 1,413,473.05