Finding the Fourth Proportional to 2,601.72, 3,903.39 and 871.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,601.72 : 3,903.39 = 871.56 : x
2. Step 2: Convert to fraction form
   2,601.72/3,903.39 = 871.56/x
3. Step 3: Cross multiply
   2,601.72x = 3,903.39 × 871.56
4. Step 4: Simplify right side
   2,601.72x = 3,402,038.59
5. Step 5: Solve for x
   x = 3,402,038.59/2,601.72
6. Step 6: Final answer
   x = 1,307.61