Finding the Fourth Proportional to 2,621.57, 3,617.87 and 1,442.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.57 : 3,617.87 = 1,442.61 : x
2. Step 2: Convert to fraction form
   2,621.57/3,617.87 = 1,442.61/x
3. Step 3: Cross multiply
   2,621.57x = 3,617.87 × 1,442.61
4. Step 4: Simplify right side
   2,621.57x = 5,219,168.23
5. Step 5: Solve for x
   x = 5,219,168.23/2,621.57
6. Step 6: Final answer
   x = 1,990.86