Finding the Fourth Proportional to 10,871.21, 16,312.05 and 5,321.53

Step by Step Solution

1. Step 1: Write the proportion equation
   10,871.21 : 16,312.05 = 5,321.53 : x
2. Step 2: Convert to fraction form
   10,871.21/16,312.05 = 5,321.53/x
3. Step 3: Cross multiply
   10,871.21x = 16,312.05 × 5,321.53
4. Step 4: Simplify right side
   10,871.21x = 86,805,083.83
5. Step 5: Solve for x
   x = 86,805,083.83/10,871.21
6. Step 6: Final answer
   x = 7,984.86