Finding the Third Proportional to 254,658 and 393,066

Step by Step Solution

1. Step 1: Write the proportion equation
   254,658 : 393,066 = 393,066 : x
2. Step 2: Convert to fraction form
   254,658/393,066 = 393,066/x
3. Step 3: Cross multiply
   254,658x = 393,066 × 393,066
4. Step 4: Simplify right side
   254,658x = 154,500,880,356
5. Step 5: Solve for x
   x = 154,500,880,356/254,658
6. Step 6: Final answer
   x = 606,699.50