Finding the Third Proportional to 168,654.50 and 256,435

Step by Step Solution

1. Step 1: Write the proportion equation
   168,654.50 : 256,435 = 256,435 : x
2. Step 2: Convert to fraction form
   168,654.50/256,435 = 256,435/x
3. Step 3: Cross multiply
   168,654.50x = 256,435 × 256,435
4. Step 4: Simplify right side
   168,654.50x = 65,758,909,225
5. Step 5: Solve for x
   x = 65,758,909,225/168,654.50
6. Step 6: Final answer
   x = 389,903.08