Finding the Fourth Proportional to 1,353.78, 2,025.81 and 1,331.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.78 : 2,025.81 = 1,331.91 : x
2. Step 2: Convert to fraction form
   1,353.78/2,025.81 = 1,331.91/x
3. Step 3: Cross multiply
   1,353.78x = 2,025.81 × 1,331.91
4. Step 4: Simplify right side
   1,353.78x = 2,698,196.60
5. Step 5: Solve for x
   x = 2,698,196.60/1,353.78
6. Step 6: Final answer
   x = 1,993.08