Finding the Fourth Proportional to 3,920.85, 5,410.61 and 2,152.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920.85 : 5,410.61 = 2,152.50 : x
2. Step 2: Convert to fraction form
   3,920.85/5,410.61 = 2,152.50/x
3. Step 3: Cross multiply
   3,920.85x = 5,410.61 × 2,152.50
4. Step 4: Simplify right side
   3,920.85x = 11,646,315.04
5. Step 5: Solve for x
   x = 11,646,315.04/3,920.85
6. Step 6: Final answer
   x = 2,970.35