Finding the Fourth Proportional to 10,005.12, 13,806.72 and 5,528.88

Step by Step Solution

1. Step 1: Write the proportion equation
   10,005.12 : 13,806.72 = 5,528.88 : x
2. Step 2: Convert to fraction form
   10,005.12/13,806.72 = 5,528.88/x
3. Step 3: Cross multiply
   10,005.12x = 13,806.72 × 5,528.88
4. Step 4: Simplify right side
   10,005.12x = 76,335,698.07
5. Step 5: Solve for x
   x = 76,335,698.07/10,005.12
6. Step 6: Final answer
   x = 7,629.66