Finding the Third Proportional to 1,328.06 and 3,121.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,328.06 : 3,121.88 = 3,121.88 : x
2. Step 2: Convert to fraction form
   1,328.06/3,121.88 = 3,121.88/x
3. Step 3: Cross multiply
   1,328.06x = 3,121.88 × 3,121.88
4. Step 4: Simplify right side
   1,328.06x = 9,746,103.52
5. Step 5: Solve for x
   x = 9,746,103.52/1,328.06
6. Step 6: Final answer
   x = 7,338.59