Finding the Fourth Proportional to 13,311.37, 19,971.22 and 3,951.43

Step by Step Solution

1. Step 1: Write the proportion equation
   13,311.37 : 19,971.22 = 3,951.43 : x
2. Step 2: Convert to fraction form
   13,311.37/19,971.22 = 3,951.43/x
3. Step 3: Cross multiply
   13,311.37x = 19,971.22 × 3,951.43
4. Step 4: Simplify right side
   13,311.37x = 78,914,908.02
5. Step 5: Solve for x
   x = 78,914,908.02/13,311.37
6. Step 6: Final answer
   x = 5,928.38