Finding the Fourth Proportional to 13,978.01, 20,916.77 and 10,271.03

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.01 : 20,916.77 = 10,271.03 : x
2. Step 2: Convert to fraction form
   13,978.01/20,916.77 = 10,271.03/x
3. Step 3: Cross multiply
   13,978.01x = 20,916.77 × 10,271.03
4. Step 4: Simplify right side
   13,978.01x = 214,836,720.82
5. Step 5: Solve for x
   x = 214,836,720.82/13,978.01
6. Step 6: Final answer
   x = 15,369.62