Finding the Third Proportional to 398,991 and 599,458.50

Step by Step Solution

1. Step 1: Write the proportion equation
   398,991 : 599,458.50 = 599,458.50 : x
2. Step 2: Convert to fraction form
   398,991/599,458.50 = 599,458.50/x
3. Step 3: Cross multiply
   398,991x = 599,458.50 × 599,458.50
4. Step 4: Simplify right side
   398,991x = 359,350,493,222.25
5. Step 5: Solve for x
   x = 359,350,493,222.25/398,991
6. Step 6: Final answer
   x = 900,648.12