Finding the Fourth Proportional to 9,356.88, 12,912.52 and 5,377.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,356.88 : 12,912.52 = 5,377.72 : x
2. Step 2: Convert to fraction form
   9,356.88/12,912.52 = 5,377.72/x
3. Step 3: Cross multiply
   9,356.88x = 12,912.52 × 5,377.72
4. Step 4: Simplify right side
   9,356.88x = 69,439,917.05
5. Step 5: Solve for x
   x = 69,439,917.05/9,356.88
6. Step 6: Final answer
   x = 7,421.27