Finding the Third Proportional to 768.50 and 1,123.50

Step by Step Solution

1. Step 1: Write the proportion equation
   768.50 : 1,123.50 = 1,123.50 : x
2. Step 2: Convert to fraction form
   768.50/1,123.50 = 1,123.50/x
3. Step 3: Cross multiply
   768.50x = 1,123.50 × 1,123.50
4. Step 4: Simplify right side
   768.50x = 1,262,252.25
5. Step 5: Solve for x
   x = 1,262,252.25/768.50
6. Step 6: Final answer
   x = 1,642.49