Finding the Fourth Proportional to 2,278.84, 3,144.72 and 1,396.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,278.84 : 3,144.72 = 1,396.12 : x
2. Step 2: Convert to fraction form
   2,278.84/3,144.72 = 1,396.12/x
3. Step 3: Cross multiply
   2,278.84x = 3,144.72 × 1,396.12
4. Step 4: Simplify right side
   2,278.84x = 4,390,406.49
5. Step 5: Solve for x
   x = 4,390,406.49/2,278.84
6. Step 6: Final answer
   x = 1,926.60