Finding the Third Proportional to 257,560 and 393,995.50

Step by Step Solution

1. Step 1: Write the proportion equation
   257,560 : 393,995.50 = 393,995.50 : x
2. Step 2: Convert to fraction form
   257,560/393,995.50 = 393,995.50/x
3. Step 3: Cross multiply
   257,560x = 393,995.50 × 393,995.50
4. Step 4: Simplify right side
   257,560x = 155,232,454,020.25
5. Step 5: Solve for x
   x = 155,232,454,020.25/257,560
6. Step 6: Final answer
   x = 602,704.05