Finding the Fourth Proportional to 13,911.50, 20,868.20 and 5,591.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,911.50 : 20,868.20 = 5,591.52 : x
2. Step 2: Convert to fraction form
   13,911.50/20,868.20 = 5,591.52/x
3. Step 3: Cross multiply
   13,911.50x = 20,868.20 × 5,591.52
4. Step 4: Simplify right side
   13,911.50x = 116,684,853.32
5. Step 5: Solve for x
   x = 116,684,853.32/13,911.50
6. Step 6: Final answer
   x = 8,387.66