Finding the Fourth Proportional to 2,517.81, 3,776.21 and 874.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,517.81 : 3,776.21 = 874.43 : x
2. Step 2: Convert to fraction form
   2,517.81/3,776.21 = 874.43/x
3. Step 3: Cross multiply
   2,517.81x = 3,776.21 × 874.43
4. Step 4: Simplify right side
   2,517.81x = 3,302,031.31
5. Step 5: Solve for x
   x = 3,302,031.31/2,517.81
6. Step 6: Final answer
   x = 1,311.47