Finding the Third Proportional to 439,585.50 and 685,060

Step by Step Solution

1. Step 1: Write the proportion equation
   439,585.50 : 685,060 = 685,060 : x
2. Step 2: Convert to fraction form
   439,585.50/685,060 = 685,060/x
3. Step 3: Cross multiply
   439,585.50x = 685,060 × 685,060
4. Step 4: Simplify right side
   439,585.50x = 469,307,203,600
5. Step 5: Solve for x
   x = 469,307,203,600/439,585.50
6. Step 6: Final answer
   x = 1,067,613.02