Finding the Fourth Proportional to 2,105.42, 3,158.18 and 871.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.42 : 3,158.18 = 871.99 : x
2. Step 2: Convert to fraction form
   2,105.42/3,158.18 = 871.99/x
3. Step 3: Cross multiply
   2,105.42x = 3,158.18 × 871.99
4. Step 4: Simplify right side
   2,105.42x = 2,753,901.38
5. Step 5: Solve for x
   x = 2,753,901.38/2,105.42
6. Step 6: Final answer
   x = 1,308.01