Finding the Fourth Proportional to 2,335.78, 3,216.54 and 2,020.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,335.78 : 3,216.54 = 2,020.60 : x
2. Step 2: Convert to fraction form
   2,335.78/3,216.54 = 2,020.60/x
3. Step 3: Cross multiply
   2,335.78x = 3,216.54 × 2,020.60
4. Step 4: Simplify right side
   2,335.78x = 6,499,340.72
5. Step 5: Solve for x
   x = 6,499,340.72/2,335.78
6. Step 6: Final answer
   x = 2,782.51