Finding the Fourth Proportional to 2,108.93, 3,162.47 and 721.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.93 : 3,162.47 = 721.89 : x
2. Step 2: Convert to fraction form
   2,108.93/3,162.47 = 721.89/x
3. Step 3: Cross multiply
   2,108.93x = 3,162.47 × 721.89
4. Step 4: Simplify right side
   2,108.93x = 2,282,951.86
5. Step 5: Solve for x
   x = 2,282,951.86/2,108.93
6. Step 6: Final answer
   x = 1,082.52