Finding the Third Proportional to 254,920.50 and 404,878.50

Step by Step Solution

1. Step 1: Write the proportion equation
   254,920.50 : 404,878.50 = 404,878.50 : x
2. Step 2: Convert to fraction form
   254,920.50/404,878.50 = 404,878.50/x
3. Step 3: Cross multiply
   254,920.50x = 404,878.50 × 404,878.50
4. Step 4: Simplify right side
   254,920.50x = 163,926,599,762.25
5. Step 5: Solve for x
   x = 163,926,599,762.25/254,920.50
6. Step 6: Final answer
   x = 643,049.89