Finding the Fourth Proportional to 2,620.78, 3,616.86 and 1,441.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.78 : 3,616.86 = 1,441.86 : x
2. Step 2: Convert to fraction form
   2,620.78/3,616.86 = 1,441.86/x
3. Step 3: Cross multiply
   2,620.78x = 3,616.86 × 1,441.86
4. Step 4: Simplify right side
   2,620.78x = 5,215,005.76
5. Step 5: Solve for x
   x = 5,215,005.76/2,620.78
6. Step 6: Final answer
   x = 1,989.87