Finding the Fourth Proportional to 15,978.47, 22,049.37 and 9,171.05

Step by Step Solution

1. Step 1: Write the proportion equation
   15,978.47 : 22,049.37 = 9,171.05 : x
2. Step 2: Convert to fraction form
   15,978.47/22,049.37 = 9,171.05/x
3. Step 3: Cross multiply
   15,978.47x = 22,049.37 × 9,171.05
4. Step 4: Simplify right side
   15,978.47x = 202,215,764.49
5. Step 5: Solve for x
   x = 202,215,764.49/15,978.47
6. Step 6: Final answer
   x = 12,655.52