Finding the Third Proportional to 1,279 and 1,400.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279 : 1,400.50 = 1,400.50 : x
2. Step 2: Convert to fraction form
   1,279/1,400.50 = 1,400.50/x
3. Step 3: Cross multiply
   1,279x = 1,400.50 × 1,400.50
4. Step 4: Simplify right side
   1,279x = 1,961,400.25
5. Step 5: Solve for x
   x = 1,961,400.25/1,279
6. Step 6: Final answer
   x = 1,533.54