Finding the Third Proportional to 1,258.69 and 2,679.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.69 : 2,679.28 = 2,679.28 : x
2. Step 2: Convert to fraction form
   1,258.69/2,679.28 = 2,679.28/x
3. Step 3: Cross multiply
   1,258.69x = 2,679.28 × 2,679.28
4. Step 4: Simplify right side
   1,258.69x = 7,178,548.02
5. Step 5: Solve for x
   x = 7,178,548.02/1,258.69
6. Step 6: Final answer
   x = 5,703.20