Finding the Fourth Proportional to 8,139.72, 12,199.80 and 2,942.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.72 : 12,199.80 = 2,942.76 : x
2. Step 2: Convert to fraction form
   8,139.72/12,199.80 = 2,942.76/x
3. Step 3: Cross multiply
   8,139.72x = 12,199.80 × 2,942.76
4. Step 4: Simplify right side
   8,139.72x = 35,901,083.45
5. Step 5: Solve for x
   x = 35,901,083.45/8,139.72
6. Step 6: Final answer
   x = 4,410.60