Finding the Fourth Proportional to 2,079.20, 3,111.12 and 1,591.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.20 : 3,111.12 = 1,591.52 : x
2. Step 2: Convert to fraction form
   2,079.20/3,111.12 = 1,591.52/x
3. Step 3: Cross multiply
   2,079.20x = 3,111.12 × 1,591.52
4. Step 4: Simplify right side
   2,079.20x = 4,951,409.70
5. Step 5: Solve for x
   x = 4,951,409.70/2,079.20
6. Step 6: Final answer
   x = 2,381.40