Finding the Fourth Proportional to 9,356.86, 12,912.54 and 5,107.96

Step by Step Solution

1. Step 1: Write the proportion equation
   9,356.86 : 12,912.54 = 5,107.96 : x
2. Step 2: Convert to fraction form
   9,356.86/12,912.54 = 5,107.96/x
3. Step 3: Cross multiply
   9,356.86x = 12,912.54 × 5,107.96
4. Step 4: Simplify right side
   9,356.86x = 65,956,737.82
5. Step 5: Solve for x
   x = 65,956,737.82/9,356.86
6. Step 6: Final answer
   x = 7,049.02