Finding the Third Proportional to 404,987.50 and 604,200.50

Step by Step Solution

1. Step 1: Write the proportion equation
   404,987.50 : 604,200.50 = 604,200.50 : x
2. Step 2: Convert to fraction form
   404,987.50/604,200.50 = 604,200.50/x
3. Step 3: Cross multiply
   404,987.50x = 604,200.50 × 604,200.50
4. Step 4: Simplify right side
   404,987.50x = 365,058,244,200.25
5. Step 5: Solve for x
   x = 365,058,244,200.25/404,987.50
6. Step 6: Final answer
   x = 901,406.20