Finding the Third Proportional to 1,391.25 and 2,147.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.25 : 2,147.25 = 2,147.25 : x
2. Step 2: Convert to fraction form
   1,391.25/2,147.25 = 2,147.25/x
3. Step 3: Cross multiply
   1,391.25x = 2,147.25 × 2,147.25
4. Step 4: Simplify right side
   1,391.25x = 4,610,682.56
5. Step 5: Solve for x
   x = 4,610,682.56/1,391.25
6. Step 6: Final answer
   x = 3,314.06