Finding the Fourth Proportional to 2,105.35, 2,905.16 and 1,161.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.35 : 2,905.16 = 1,161.09 : x
2. Step 2: Convert to fraction form
   2,105.35/2,905.16 = 1,161.09/x
3. Step 3: Cross multiply
   2,105.35x = 2,905.16 × 1,161.09
4. Step 4: Simplify right side
   2,105.35x = 3,373,152.22
5. Step 5: Solve for x
   x = 3,373,152.22/2,105.35
6. Step 6: Final answer
   x = 1,602.18