Finding the Third Proportional to 253,573.50 and 394,900.50

Step by Step Solution

1. Step 1: Write the proportion equation
   253,573.50 : 394,900.50 = 394,900.50 : x
2. Step 2: Convert to fraction form
   253,573.50/394,900.50 = 394,900.50/x
3. Step 3: Cross multiply
   253,573.50x = 394,900.50 × 394,900.50
4. Step 4: Simplify right side
   253,573.50x = 155,946,404,900.25
5. Step 5: Solve for x
   x = 155,946,404,900.25/253,573.50
6. Step 6: Final answer
   x = 614,994.88