Finding the Third Proportional to 1,288.31 and 3,058.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.31 : 3,058.69 = 3,058.69 : x
2. Step 2: Convert to fraction form
   1,288.31/3,058.69 = 3,058.69/x
3. Step 3: Cross multiply
   1,288.31x = 3,058.69 × 3,058.69
4. Step 4: Simplify right side
   1,288.31x = 9,355,569.22
5. Step 5: Solve for x
   x = 9,355,569.22/1,288.31
6. Step 6: Final answer
   x = 7,261.88