Finding the Third Proportional to 3,386.81 and 7,912.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,386.81 : 7,912.69 = 7,912.69 : x
2. Step 2: Convert to fraction form
   3,386.81/7,912.69 = 7,912.69/x
3. Step 3: Cross multiply
   3,386.81x = 7,912.69 × 7,912.69
4. Step 4: Simplify right side
   3,386.81x = 62,610,623.47
5. Step 5: Solve for x
   x = 62,610,623.47/3,386.81
6. Step 6: Final answer
   x = 18,486.59