Finding the Fourth Proportional to 13,311.56, 19,971.50 and 3,951.62

Step by Step Solution

1. Step 1: Write the proportion equation
   13,311.56 : 19,971.50 = 3,951.62 : x
2. Step 2: Convert to fraction form
   13,311.56/19,971.50 = 3,951.62/x
3. Step 3: Cross multiply
   13,311.56x = 19,971.50 × 3,951.62
4. Step 4: Simplify right side
   13,311.56x = 78,919,759.07
5. Step 5: Solve for x
   x = 78,919,759.07/13,311.56
6. Step 6: Final answer
   x = 5,928.66