Finding the Fourth Proportional to 2,293.12, 3,440.76 and 1,138.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,293.12 : 3,440.76 = 1,138.72 : x
2. Step 2: Convert to fraction form
   2,293.12/3,440.76 = 1,138.72/x
3. Step 3: Cross multiply
   2,293.12x = 3,440.76 × 1,138.72
4. Step 4: Simplify right side
   2,293.12x = 3,918,062.23
5. Step 5: Solve for x
   x = 3,918,062.23/2,293.12
6. Step 6: Final answer
   x = 1,708.62