Finding the Fourth Proportional to 2,602.43, 3,903.68 and 871.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,602.43 : 3,903.68 = 871.05 : x
2. Step 2: Convert to fraction form
   2,602.43/3,903.68 = 871.05/x
3. Step 3: Cross multiply
   2,602.43x = 3,903.68 × 871.05
4. Step 4: Simplify right side
   2,602.43x = 3,400,300.46
5. Step 5: Solve for x
   x = 3,400,300.46/2,602.43
6. Step 6: Final answer
   x = 1,306.59