Finding the Third Proportional to 2,606.87 and 5,386.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,606.87 : 5,386.18 = 5,386.18 : x
2. Step 2: Convert to fraction form
   2,606.87/5,386.18 = 5,386.18/x
3. Step 3: Cross multiply
   2,606.87x = 5,386.18 × 5,386.18
4. Step 4: Simplify right side
   2,606.87x = 29,010,973.71
5. Step 5: Solve for x
   x = 29,010,973.71/2,606.87
6. Step 6: Final answer
   x = 11,128.66