Finding the Fourth Proportional to 2,603.17, 3,905.34 and 871.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.17 : 3,905.34 = 871.75 : x
2. Step 2: Convert to fraction form
   2,603.17/3,905.34 = 871.75/x
3. Step 3: Cross multiply
   2,603.17x = 3,905.34 × 871.75
4. Step 4: Simplify right side
   2,603.17x = 3,404,480.15
5. Step 5: Solve for x
   x = 3,404,480.15/2,603.17
6. Step 6: Final answer
   x = 1,307.82