Finding the Fourth Proportional to 5,399.75, 8,086.86 and 4,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,399.75 : 8,086.86 = 4,221.50 : x
2. Step 2: Convert to fraction form
   5,399.75/8,086.86 = 4,221.50/x
3. Step 3: Cross multiply
   5,399.75x = 8,086.86 × 4,221.50
4. Step 4: Simplify right side
   5,399.75x = 34,138,639.06
5. Step 5: Solve for x
   x = 34,138,639.06/5,399.75
6. Step 6: Final answer
   x = 6,322.27