Finding the Third Proportional to 772.88 and 1,128.94

Step by Step Solution

1. Step 1: Write the proportion equation
   772.88 : 1,128.94 = 1,128.94 : x
2. Step 2: Convert to fraction form
   772.88/1,128.94 = 1,128.94/x
3. Step 3: Cross multiply
   772.88x = 1,128.94 × 1,128.94
4. Step 4: Simplify right side
   772.88x = 1,274,499.88
5. Step 5: Solve for x
   x = 1,274,499.88/772.88
6. Step 6: Final answer
   x = 1,649.04