Finding the Third Proportional to 455,445 and 680,658.75

Step by Step Solution

1. Step 1: Write the proportion equation
   455,445 : 680,658.75 = 680,658.75 : x
2. Step 2: Convert to fraction form
   455,445/680,658.75 = 680,658.75/x
3. Step 3: Cross multiply
   455,445x = 680,658.75 × 680,658.75
4. Step 4: Simplify right side
   455,445x = 463,296,333,951.56
5. Step 5: Solve for x
   x = 463,296,333,951.56/455,445
6. Step 6: Final answer
   x = 1,017,238.82