Finding the Fourth Proportional to 2,108.35, 3,162.86 and 721.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.35 : 3,162.86 = 721.76 : x
2. Step 2: Convert to fraction form
   2,108.35/3,162.86 = 721.76/x
3. Step 3: Cross multiply
   2,108.35x = 3,162.86 × 721.76
4. Step 4: Simplify right side
   2,108.35x = 2,282,825.83
5. Step 5: Solve for x
   x = 2,282,825.83/2,108.35
6. Step 6: Final answer
   x = 1,082.75