Finding the Fourth Proportional to 3,721.55, 5,581.94 and 1,871.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,721.55 : 5,581.94 = 1,871.91 : x
2. Step 2: Convert to fraction form
   3,721.55/5,581.94 = 1,871.91/x
3. Step 3: Cross multiply
   3,721.55x = 5,581.94 × 1,871.91
4. Step 4: Simplify right side
   3,721.55x = 10,448,889.31
5. Step 5: Solve for x
   x = 10,448,889.31/3,721.55
6. Step 6: Final answer
   x = 2,807.67