Finding the Fourth Proportional to 2,216.26, 3,317.37 and 1,239.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.26 : 3,317.37 = 1,239.40 : x
2. Step 2: Convert to fraction form
   2,216.26/3,317.37 = 1,239.40/x
3. Step 3: Cross multiply
   2,216.26x = 3,317.37 × 1,239.40
4. Step 4: Simplify right side
   2,216.26x = 4,111,548.38
5. Step 5: Solve for x
   x = 4,111,548.38/2,216.26
6. Step 6: Final answer
   x = 1,855.17