Finding the Fourth Proportional to 2,618.01, 3,612.74 and 1,439.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.01 : 3,612.74 = 1,439.06 : x
2. Step 2: Convert to fraction form
   2,618.01/3,612.74 = 1,439.06/x
3. Step 3: Cross multiply
   2,618.01x = 3,612.74 × 1,439.06
4. Step 4: Simplify right side
   2,618.01x = 5,198,924.37
5. Step 5: Solve for x
   x = 5,198,924.37/2,618.01
6. Step 6: Final answer
   x = 1,985.83