Finding the Fourth Proportional to 11,109.12, 16,659.60 and 3,315.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,109.12 : 16,659.60 = 3,315.28 : x
2. Step 2: Convert to fraction form
   11,109.12/16,659.60 = 3,315.28/x
3. Step 3: Cross multiply
   11,109.12x = 16,659.60 × 3,315.28
4. Step 4: Simplify right side
   11,109.12x = 55,231,238.69
5. Step 5: Solve for x
   x = 55,231,238.69/11,109.12
6. Step 6: Final answer
   x = 4,971.70