Finding the Third Proportional to 399,022.50 and 613,333.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,022.50 : 613,333.50 = 613,333.50 : x
2. Step 2: Convert to fraction form
   399,022.50/613,333.50 = 613,333.50/x
3. Step 3: Cross multiply
   399,022.50x = 613,333.50 × 613,333.50
4. Step 4: Simplify right side
   399,022.50x = 376,177,982,222.25
5. Step 5: Solve for x
   x = 376,177,982,222.25/399,022.50
6. Step 6: Final answer
   x = 942,748.80