Finding the Third Proportional to 393,712.50 and 813,672

Step by Step Solution

1. Step 1: Write the proportion equation
   393,712.50 : 813,672 = 813,672 : x
2. Step 2: Convert to fraction form
   393,712.50/813,672 = 813,672/x
3. Step 3: Cross multiply
   393,712.50x = 813,672 × 813,672
4. Step 4: Simplify right side
   393,712.50x = 662,062,123,584
5. Step 5: Solve for x
   x = 662,062,123,584/393,712.50
6. Step 6: Final answer
   x = 1,681,587.77