Finding the Third Proportional to 398,641.50 and 605,340

Step by Step Solution

1. Step 1: Write the proportion equation
   398,641.50 : 605,340 = 605,340 : x
2. Step 2: Convert to fraction form
   398,641.50/605,340 = 605,340/x
3. Step 3: Cross multiply
   398,641.50x = 605,340 × 605,340
4. Step 4: Simplify right side
   398,641.50x = 366,436,515,600
5. Step 5: Solve for x
   x = 366,436,515,600/398,641.50
6. Step 6: Final answer
   x = 919,213.17