Finding the Fourth Proportional to 3,913.53, 5,871.69 and 1,721.99

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.53 : 5,871.69 = 1,721.99 : x
2. Step 2: Convert to fraction form
   3,913.53/5,871.69 = 1,721.99/x
3. Step 3: Cross multiply
   3,913.53x = 5,871.69 × 1,721.99
4. Step 4: Simplify right side
   3,913.53x = 10,110,962.10
5. Step 5: Solve for x
   x = 10,110,962.10/3,913.53
6. Step 6: Final answer
   x = 2,583.59