Finding the Fourth Proportional to 11,103.12, 15,317.10 and 7,122.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,103.12 : 15,317.10 = 7,122.78 : x
2. Step 2: Convert to fraction form
   11,103.12/15,317.10 = 7,122.78/x
3. Step 3: Cross multiply
   11,103.12x = 15,317.10 × 7,122.78
4. Step 4: Simplify right side
   11,103.12x = 109,100,333.54
5. Step 5: Solve for x
   x = 109,100,333.54/11,103.12
6. Step 6: Final answer
   x = 9,826.10