Finding the Third Proportional to 254,859 and 404,890.50

Step by Step Solution

1. Step 1: Write the proportion equation
   254,859 : 404,890.50 = 404,890.50 : x
2. Step 2: Convert to fraction form
   254,859/404,890.50 = 404,890.50/x
3. Step 3: Cross multiply
   254,859x = 404,890.50 × 404,890.50
4. Step 4: Simplify right side
   254,859x = 163,936,316,990.25
5. Step 5: Solve for x
   x = 163,936,316,990.25/254,859
6. Step 6: Final answer
   x = 643,243.19