Finding the Third Proportional to 248,610 and 394,288.50

Step by Step Solution

1. Step 1: Write the proportion equation
   248,610 : 394,288.50 = 394,288.50 : x
2. Step 2: Convert to fraction form
   248,610/394,288.50 = 394,288.50/x
3. Step 3: Cross multiply
   248,610x = 394,288.50 × 394,288.50
4. Step 4: Simplify right side
   248,610x = 155,463,421,232.25
5. Step 5: Solve for x
   x = 155,463,421,232.25/248,610
6. Step 6: Final answer
   x = 625,330.52