Finding the Third Proportional to 271,876.50 and 428,449.50

Step by Step Solution

1. Step 1: Write the proportion equation
   271,876.50 : 428,449.50 = 428,449.50 : x
2. Step 2: Convert to fraction form
   271,876.50/428,449.50 = 428,449.50/x
3. Step 3: Cross multiply
   271,876.50x = 428,449.50 × 428,449.50
4. Step 4: Simplify right side
   271,876.50x = 183,568,974,050.25
5. Step 5: Solve for x
   x = 183,568,974,050.25/271,876.50
6. Step 6: Final answer
   x = 675,192.50