Finding the Fourth Proportional to 3,920.91, 5,411.00 and 2,152.65

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920.91 : 5,411.00 = 2,152.65 : x
2. Step 2: Convert to fraction form
   3,920.91/5,411.00 = 2,152.65/x
3. Step 3: Cross multiply
   3,920.91x = 5,411.00 × 2,152.65
4. Step 4: Simplify right side
   3,920.91x = 11,647,978.39
5. Step 5: Solve for x
   x = 11,647,978.39/3,920.91
6. Step 6: Final answer
   x = 2,970.73