Finding the Fourth Proportional to 2,513.98, 3,772.11 and 871.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,513.98 : 3,772.11 = 871.72 : x
2. Step 2: Convert to fraction form
   2,513.98/3,772.11 = 871.72/x
3. Step 3: Cross multiply
   2,513.98x = 3,772.11 × 871.72
4. Step 4: Simplify right side
   2,513.98x = 3,288,223.73
5. Step 5: Solve for x
   x = 3,288,223.73/2,513.98
6. Step 6: Final answer
   x = 1,307.98