Finding the Third Proportional to 1,391.91 and 2,743.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.91 : 2,743.31 = 2,743.31 : x
2. Step 2: Convert to fraction form
   1,391.91/2,743.31 = 2,743.31/x
3. Step 3: Cross multiply
   1,391.91x = 2,743.31 × 2,743.31
4. Step 4: Simplify right side
   1,391.91x = 7,525,763.47
5. Step 5: Solve for x
   x = 7,525,763.47/1,391.91
6. Step 6: Final answer
   x = 5,406.80