Finding the Fourth Proportional to 11,018.72, 16,528.04 and 3,121.32

Step by Step Solution

1. Step 1: Write the proportion equation
   11,018.72 : 16,528.04 = 3,121.32 : x
2. Step 2: Convert to fraction form
   11,018.72/16,528.04 = 3,121.32/x
3. Step 3: Cross multiply
   11,018.72x = 16,528.04 × 3,121.32
4. Step 4: Simplify right side
   11,018.72x = 51,589,301.81
5. Step 5: Solve for x
   x = 51,589,301.81/11,018.72
6. Step 6: Final answer
   x = 4,681.97