Finding the Fourth Proportional to 2,274.54, 3,139.16 and 1,390.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.54 : 3,139.16 = 1,390.16 : x
2. Step 2: Convert to fraction form
   2,274.54/3,139.16 = 1,390.16/x
3. Step 3: Cross multiply
   2,274.54x = 3,139.16 × 1,390.16
4. Step 4: Simplify right side
   2,274.54x = 4,363,912.02
5. Step 5: Solve for x
   x = 4,363,912.02/2,274.54
6. Step 6: Final answer
   x = 1,918.59