Finding the Fourth Proportional to 2,621.72, 3,617.90 and 1,442.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.72 : 3,617.90 = 1,442.78 : x
2. Step 2: Convert to fraction form
   2,621.72/3,617.90 = 1,442.78/x
3. Step 3: Cross multiply
   2,621.72x = 3,617.90 × 1,442.78
4. Step 4: Simplify right side
   2,621.72x = 5,219,833.76
5. Step 5: Solve for x
   x = 5,219,833.76/2,621.72
6. Step 6: Final answer
   x = 1,991.00