Finding the Fourth Proportional to 8,139.12, 12,208.56 and 2,943.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.12 : 12,208.56 = 2,943.72 : x
2. Step 2: Convert to fraction form
   8,139.12/12,208.56 = 2,943.72/x
3. Step 3: Cross multiply
   8,139.12x = 12,208.56 × 2,943.72
4. Step 4: Simplify right side
   8,139.12x = 35,938,582.24
5. Step 5: Solve for x
   x = 35,938,582.24/8,139.12
6. Step 6: Final answer
   x = 4,415.54