Finding the Third Proportional to 1,279.69 and 3,386.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.69 : 3,386.81 = 3,386.81 : x
2. Step 2: Convert to fraction form
   1,279.69/3,386.81 = 3,386.81/x
3. Step 3: Cross multiply
   1,279.69x = 3,386.81 × 3,386.81
4. Step 4: Simplify right side
   1,279.69x = 11,470,498.91
5. Step 5: Solve for x
   x = 11,470,498.91/1,279.69
6. Step 6: Final answer
   x = 8,963.52