Finding the Fourth Proportional to 12,879.45, 17,773.86 and 7,214.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,879.45 : 17,773.86 = 7,214.15 : x
2. Step 2: Convert to fraction form
   12,879.45/17,773.86 = 7,214.15/x
3. Step 3: Cross multiply
   12,879.45x = 17,773.86 × 7,214.15
4. Step 4: Simplify right side
   12,879.45x = 128,223,265.72
5. Step 5: Solve for x
   x = 128,223,265.72/12,879.45
6. Step 6: Final answer
   x = 9,955.65