Finding the Fourth Proportional to 10,004.28, 13,806.07 and 5,528.03

Step by Step Solution

1. Step 1: Write the proportion equation
   10,004.28 : 13,806.07 = 5,528.03 : x
2. Step 2: Convert to fraction form
   10,004.28/13,806.07 = 5,528.03/x
3. Step 3: Cross multiply
   10,004.28x = 13,806.07 × 5,528.03
4. Step 4: Simplify right side
   10,004.28x = 76,320,286.29
5. Step 5: Solve for x
   x = 76,320,286.29/10,004.28
6. Step 6: Final answer
   x = 7,628.77