Finding the Third Proportional to 254,840 and 404,860.50

Step by Step Solution

1. Step 1: Write the proportion equation
   254,840 : 404,860.50 = 404,860.50 : x
2. Step 2: Convert to fraction form
   254,840/404,860.50 = 404,860.50/x
3. Step 3: Cross multiply
   254,840x = 404,860.50 × 404,860.50
4. Step 4: Simplify right side
   254,840x = 163,912,024,460.25
5. Step 5: Solve for x
   x = 163,912,024,460.25/254,840
6. Step 6: Final answer
   x = 643,195.83