Finding the Third Proportional to 278,350.50 and 620,448

Step by Step Solution

1. Step 1: Write the proportion equation
   278,350.50 : 620,448 = 620,448 : x
2. Step 2: Convert to fraction form
   278,350.50/620,448 = 620,448/x
3. Step 3: Cross multiply
   278,350.50x = 620,448 × 620,448
4. Step 4: Simplify right side
   278,350.50x = 384,955,720,704
5. Step 5: Solve for x
   x = 384,955,720,704/278,350.50
6. Step 6: Final answer
   x = 1,382,989.15