Finding the Third Proportional to 687,067.50 and 903,490.50

Step by Step Solution

1. Step 1: Write the proportion equation
   687,067.50 : 903,490.50 = 903,490.50 : x
2. Step 2: Convert to fraction form
   687,067.50/903,490.50 = 903,490.50/x
3. Step 3: Cross multiply
   687,067.50x = 903,490.50 × 903,490.50
4. Step 4: Simplify right side
   687,067.50x = 816,295,083,590.25
5. Step 5: Solve for x
   x = 816,295,083,590.25/687,067.50
6. Step 6: Final answer
   x = 1,188,085.72