Finding the Fourth Proportional to 2,280.42, 3,146.40 and 1,395.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.42 : 3,146.40 = 1,395.90 : x
2. Step 2: Convert to fraction form
   2,280.42/3,146.40 = 1,395.90/x
3. Step 3: Cross multiply
   2,280.42x = 3,146.40 × 1,395.90
4. Step 4: Simplify right side
   2,280.42x = 4,392,059.76
5. Step 5: Solve for x
   x = 4,392,059.76/2,280.42
6. Step 6: Final answer
   x = 1,925.99