Finding the Fourth Proportional to 12,879.50, 17,773.53 and 7,214.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,879.50 : 17,773.53 = 7,214.28 : x
2. Step 2: Convert to fraction form
   12,879.50/17,773.53 = 7,214.28/x
3. Step 3: Cross multiply
   12,879.50x = 17,773.53 × 7,214.28
4. Step 4: Simplify right side
   12,879.50x = 128,223,222.01
5. Step 5: Solve for x
   x = 128,223,222.01/12,879.50
6. Step 6: Final answer
   x = 9,955.61