Finding the Fourth Proportional to 12,406.76, 17,121.72 and 7,103.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,406.76 : 17,121.72 = 7,103.28 : x
2. Step 2: Convert to fraction form
   12,406.76/17,121.72 = 7,103.28/x
3. Step 3: Cross multiply
   12,406.76x = 17,121.72 × 7,103.28
4. Step 4: Simplify right side
   12,406.76x = 121,620,371.24
5. Step 5: Solve for x
   x = 121,620,371.24/12,406.76
6. Step 6: Final answer
   x = 9,802.75