Finding the Fourth Proportional to 2,431.22, 3,640.98 and 1,388.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,431.22 : 3,640.98 = 1,388.06 : x
2. Step 2: Convert to fraction form
   2,431.22/3,640.98 = 1,388.06/x
3. Step 3: Cross multiply
   2,431.22x = 3,640.98 × 1,388.06
4. Step 4: Simplify right side
   2,431.22x = 5,053,903.10
5. Step 5: Solve for x
   x = 5,053,903.10/2,431.22
6. Step 6: Final answer
   x = 2,078.75