Finding the Fourth Proportional to 3,889.29, 5,332.32 and 3,819.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,889.29 : 5,332.32 = 3,819.30 : x
2. Step 2: Convert to fraction form
   3,889.29/5,332.32 = 3,819.30/x
3. Step 3: Cross multiply
   3,889.29x = 5,332.32 × 3,819.30
4. Step 4: Simplify right side
   3,889.29x = 20,365,729.78
5. Step 5: Solve for x
   x = 20,365,729.78/3,889.29
6. Step 6: Final answer
   x = 5,236.36