Finding the Third Proportional to 677,643.50 and 903,404.50

Step by Step Solution

1. Step 1: Write the proportion equation
   677,643.50 : 903,404.50 = 903,404.50 : x
2. Step 2: Convert to fraction form
   677,643.50/903,404.50 = 903,404.50/x
3. Step 3: Cross multiply
   677,643.50x = 903,404.50 × 903,404.50
4. Step 4: Simplify right side
   677,643.50x = 816,139,690,620.25
5. Step 5: Solve for x
   x = 816,139,690,620.25/677,643.50
6. Step 6: Final answer
   x = 1,204,379.13