Finding the Fourth Proportional to 2,108.01, 3,162.39 and 721.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.01 : 3,162.39 = 721.02 : x
2. Step 2: Convert to fraction form
   2,108.01/3,162.39 = 721.02/x
3. Step 3: Cross multiply
   2,108.01x = 3,162.39 × 721.02
4. Step 4: Simplify right side
   2,108.01x = 2,280,142.83
5. Step 5: Solve for x
   x = 2,280,142.83/2,108.01
6. Step 6: Final answer
   x = 1,081.66