Finding the Fourth Proportional to 2,116.40, 3,175.37 and 1,239.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.40 : 3,175.37 = 1,239.25 : x
2. Step 2: Convert to fraction form
   2,116.40/3,175.37 = 1,239.25/x
3. Step 3: Cross multiply
   2,116.40x = 3,175.37 × 1,239.25
4. Step 4: Simplify right side
   2,116.40x = 3,935,055.20
5. Step 5: Solve for x
   x = 3,935,055.20/2,116.40
6. Step 6: Final answer
   x = 1,859.32