Finding the Third Proportional to 1,390.22 and 2,760.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.22 : 2,760.19 = 2,760.19 : x
2. Step 2: Convert to fraction form
   1,390.22/2,760.19 = 2,760.19/x
3. Step 3: Cross multiply
   1,390.22x = 2,760.19 × 2,760.19
4. Step 4: Simplify right side
   1,390.22x = 7,618,635.04
5. Step 5: Solve for x
   x = 7,618,635.04/1,390.22
6. Step 6: Final answer
   x = 5,480.17