Finding the Fourth Proportional to 3,920.90, 5,410.59 and 2,152.49

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920.90 : 5,410.59 = 2,152.49 : x
2. Step 2: Convert to fraction form
   3,920.90/5,410.59 = 2,152.49/x
3. Step 3: Cross multiply
   3,920.90x = 5,410.59 × 2,152.49
4. Step 4: Simplify right side
   3,920.90x = 11,646,254.40
5. Step 5: Solve for x
   x = 11,646,254.40/3,920.90
6. Step 6: Final answer
   x = 2,970.31