Finding the Fourth Proportional to 3,920.90, 5,410.86 and 2,152.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920.90 : 5,410.86 = 2,152.52 : x
2. Step 2: Convert to fraction form
   3,920.90/5,410.86 = 2,152.52/x
3. Step 3: Cross multiply
   3,920.90x = 5,410.86 × 2,152.52
4. Step 4: Simplify right side
   3,920.90x = 11,646,984.37
5. Step 5: Solve for x
   x = 11,646,984.37/3,920.90
6. Step 6: Final answer
   x = 2,970.49