Finding the Third Proportional to 163,318.50 and 256,644

Step by Step Solution

1. Step 1: Write the proportion equation
   163,318.50 : 256,644 = 256,644 : x
2. Step 2: Convert to fraction form
   163,318.50/256,644 = 256,644/x
3. Step 3: Cross multiply
   163,318.50x = 256,644 × 256,644
4. Step 4: Simplify right side
   163,318.50x = 65,866,142,736
5. Step 5: Solve for x
   x = 65,866,142,736/163,318.50
6. Step 6: Final answer
   x = 403,298.72