Finding the Third Proportional to 208,609 and 428,276.50

Step by Step Solution

1. Step 1: Write the proportion equation
   208,609 : 428,276.50 = 428,276.50 : x
2. Step 2: Convert to fraction form
   208,609/428,276.50 = 428,276.50/x
3. Step 3: Cross multiply
   208,609x = 428,276.50 × 428,276.50
4. Step 4: Simplify right side
   208,609x = 183,420,760,452.25
5. Step 5: Solve for x
   x = 183,420,760,452.25/208,609
6. Step 6: Final answer
   x = 879,256.22