Finding the Fourth Proportional to 2,621.65, 3,617.79 and 1,442.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.65 : 3,617.79 = 1,442.71 : x
2. Step 2: Convert to fraction form
   2,621.65/3,617.79 = 1,442.71/x
3. Step 3: Cross multiply
   2,621.65x = 3,617.79 × 1,442.71
4. Step 4: Simplify right side
   2,621.65x = 5,219,421.81
5. Step 5: Solve for x
   x = 5,219,421.81/2,621.65
6. Step 6: Final answer
   x = 1,990.89