Finding the Fourth Proportional to 2,081.52, 3,123 and 1,390.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.52 : 3,123 = 1,390.96 : x
2. Step 2: Convert to fraction form
   2,081.52/3,123 = 1,390.96/x
3. Step 3: Cross multiply
   2,081.52x = 3,123 × 1,390.96
4. Step 4: Simplify right side
   2,081.52x = 4,343,968.08
5. Step 5: Solve for x
   x = 4,343,968.08/2,081.52
6. Step 6: Final answer
   x = 2,086.92