Finding the Third Proportional to 394,172.50 and 608,990

Step by Step Solution

1. Step 1: Write the proportion equation
   394,172.50 : 608,990 = 608,990 : x
2. Step 2: Convert to fraction form
   394,172.50/608,990 = 608,990/x
3. Step 3: Cross multiply
   394,172.50x = 608,990 × 608,990
4. Step 4: Simplify right side
   394,172.50x = 370,868,820,100
5. Step 5: Solve for x
   x = 370,868,820,100/394,172.50
6. Step 6: Final answer
   x = 940,879.49