Finding the Third Proportional to 1,276.70 and 2,669.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.70 : 2,669.20 = 2,669.20 : x
2. Step 2: Convert to fraction form
   1,276.70/2,669.20 = 2,669.20/x
3. Step 3: Cross multiply
   1,276.70x = 2,669.20 × 2,669.20
4. Step 4: Simplify right side
   1,276.70x = 7,124,645.32
5. Step 5: Solve for x
   x = 7,124,645.32/1,276.70
6. Step 6: Final answer
   x = 5,580.52