Finding the Third Proportional to 257,467.50 and 393,858

Step by Step Solution

1. Step 1: Write the proportion equation
   257,467.50 : 393,858 = 393,858 : x
2. Step 2: Convert to fraction form
   257,467.50/393,858 = 393,858/x
3. Step 3: Cross multiply
   257,467.50x = 393,858 × 393,858
4. Step 4: Simplify right side
   257,467.50x = 155,124,124,164
5. Step 5: Solve for x
   x = 155,124,124,164/257,467.50
6. Step 6: Final answer
   x = 602,499.83