Finding the Fourth Proportional to 2,274.30, 3,138.72 and 1,390.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.30 : 3,138.72 = 1,390.29 : x
2. Step 2: Convert to fraction form
   2,274.30/3,138.72 = 1,390.29/x
3. Step 3: Cross multiply
   2,274.30x = 3,138.72 × 1,390.29
4. Step 4: Simplify right side
   2,274.30x = 4,363,731.03
5. Step 5: Solve for x
   x = 4,363,731.03/2,274.30
6. Step 6: Final answer
   x = 1,918.71