Finding the Fourth Proportional to 2,105.59, 2,905.58 and 1,161.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.59 : 2,905.58 = 1,161.39 : x
2. Step 2: Convert to fraction form
   2,105.59/2,905.58 = 1,161.39/x
3. Step 3: Cross multiply
   2,105.59x = 2,905.58 × 1,161.39
4. Step 4: Simplify right side
   2,105.59x = 3,374,511.56
5. Step 5: Solve for x
   x = 3,374,511.56/2,105.59
6. Step 6: Final answer
   x = 1,602.64