Finding the Fourth Proportional to 2,080.78, 3,123.60 and 1,353.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.78 : 3,123.60 = 1,353.40 : x
2. Step 2: Convert to fraction form
   2,080.78/3,123.60 = 1,353.40/x
3. Step 3: Cross multiply
   2,080.78x = 3,123.60 × 1,353.40
4. Step 4: Simplify right side
   2,080.78x = 4,227,480.24
5. Step 5: Solve for x
   x = 4,227,480.24/2,080.78
6. Step 6: Final answer
   x = 2,031.68