Finding the Third Proportional to 2,355.75 and 5,120.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,355.75 : 5,120.72 = 5,120.72 : x
2. Step 2: Convert to fraction form
   2,355.75/5,120.72 = 5,120.72/x
3. Step 3: Cross multiply
   2,355.75x = 5,120.72 × 5,120.72
4. Step 4: Simplify right side
   2,355.75x = 26,221,760.52
5. Step 5: Solve for x
   x = 26,221,760.52/2,355.75
6. Step 6: Final answer
   x = 11,130.96