Finding the Third Proportional to 1,391.06 and 2,166.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.06 : 2,166.38 = 2,166.38 : x
2. Step 2: Convert to fraction form
   1,391.06/2,166.38 = 2,166.38/x
3. Step 3: Cross multiply
   1,391.06x = 2,166.38 × 2,166.38
4. Step 4: Simplify right side
   1,391.06x = 4,693,180.64
5. Step 5: Solve for x
   x = 4,693,180.64/1,391.06
6. Step 6: Final answer
   x = 3,373.81