Finding the Third Proportional to 261,485 and 404,053.50

Step by Step Solution

1. Step 1: Write the proportion equation
   261,485 : 404,053.50 = 404,053.50 : x
2. Step 2: Convert to fraction form
   261,485/404,053.50 = 404,053.50/x
3. Step 3: Cross multiply
   261,485x = 404,053.50 × 404,053.50
4. Step 4: Simplify right side
   261,485x = 163,259,230,862.25
5. Step 5: Solve for x
   x = 163,259,230,862.25/261,485
6. Step 6: Final answer
   x = 624,354.10