Finding the Fourth Proportional to 3,717.72, 5,128.32 and 2,145.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,717.72 : 5,128.32 = 2,145.52 : x
2. Step 2: Convert to fraction form
   3,717.72/5,128.32 = 2,145.52/x
3. Step 3: Cross multiply
   3,717.72x = 5,128.32 × 2,145.52
4. Step 4: Simplify right side
   3,717.72x = 11,002,913.13
5. Step 5: Solve for x
   x = 11,002,913.13/3,717.72
6. Step 6: Final answer
   x = 2,959.59