Finding the Fourth Proportional to 2,105.95, 2,906.22 and 1,161.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.95 : 2,906.22 = 1,161.72 : x
2. Step 2: Convert to fraction form
   2,105.95/2,906.22 = 1,161.72/x
3. Step 3: Cross multiply
   2,105.95x = 2,906.22 × 1,161.72
4. Step 4: Simplify right side
   2,105.95x = 3,376,224.80
5. Step 5: Solve for x
   x = 3,376,224.80/2,105.95
6. Step 6: Final answer
   x = 1,603.19