Finding the Fourth Proportional to 9,356.72, 12,912.30 and 5,107.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,356.72 : 12,912.30 = 5,107.79 : x
2. Step 2: Convert to fraction form
   9,356.72/12,912.30 = 5,107.79/x
3. Step 3: Cross multiply
   9,356.72x = 12,912.30 × 5,107.79
4. Step 4: Simplify right side
   9,356.72x = 65,953,297.11
5. Step 5: Solve for x
   x = 65,953,297.11/9,356.72
6. Step 6: Final answer
   x = 7,048.76