Finding the Fourth Proportional to 8,138, 12,199.76 and 2,942.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,138 : 12,199.76 = 2,942.72 : x
2. Step 2: Convert to fraction form
   8,138/12,199.76 = 2,942.72/x
3. Step 3: Cross multiply
   8,138x = 12,199.76 × 2,942.72
4. Step 4: Simplify right side
   8,138x = 35,900,477.75
5. Step 5: Solve for x
   x = 35,900,477.75/8,138
6. Step 6: Final answer
   x = 4,411.46