Finding the Third Proportional to 698,671.50 and 988,819.50

Step by Step Solution

1. Step 1: Write the proportion equation
   698,671.50 : 988,819.50 = 988,819.50 : x
2. Step 2: Convert to fraction form
   698,671.50/988,819.50 = 988,819.50/x
3. Step 3: Cross multiply
   698,671.50x = 988,819.50 × 988,819.50
4. Step 4: Simplify right side
   698,671.50x = 977,764,003,580.25
5. Step 5: Solve for x
   x = 977,764,003,580.25/698,671.50
6. Step 6: Final answer
   x = 1,399,461.70