Finding the Fourth Proportional to 3,920.72, 5,410.68 and 2,152.32

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920.72 : 5,410.68 = 2,152.32 : x
2. Step 2: Convert to fraction form
   3,920.72/5,410.68 = 2,152.32/x
3. Step 3: Cross multiply
   3,920.72x = 5,410.68 × 2,152.32
4. Step 4: Simplify right side
   3,920.72x = 11,645,514.78
5. Step 5: Solve for x
   x = 11,645,514.78/3,920.72
6. Step 6: Final answer
   x = 2,970.25