Finding the Fourth Proportional to 2,118.24, 3,171.69 and 1,240.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.24 : 3,171.69 = 1,240.02 : x
2. Step 2: Convert to fraction form
   2,118.24/3,171.69 = 1,240.02/x
3. Step 3: Cross multiply
   2,118.24x = 3,171.69 × 1,240.02
4. Step 4: Simplify right side
   2,118.24x = 3,932,959.03
5. Step 5: Solve for x
   x = 3,932,959.03/2,118.24
6. Step 6: Final answer
   x = 1,856.71