Finding the Fourth Proportional to 9,336.16, 12,883.60 and 5,357.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,336.16 : 12,883.60 = 5,357.21 : x
2. Step 2: Convert to fraction form
   9,336.16/12,883.60 = 5,357.21/x
3. Step 3: Cross multiply
   9,336.16x = 12,883.60 × 5,357.21
4. Step 4: Simplify right side
   9,336.16x = 69,020,150.76
5. Step 5: Solve for x
   x = 69,020,150.76/9,336.16
6. Step 6: Final answer
   x = 7,392.78