Finding the Fourth Proportional to 9,360, 12,918.24 and 5,636.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,360 : 12,918.24 = 5,636.16 : x
2. Step 2: Convert to fraction form
   9,360/12,918.24 = 5,636.16/x
3. Step 3: Cross multiply
   9,360x = 12,918.24 × 5,636.16
4. Step 4: Simplify right side
   9,360x = 72,809,267.56
5. Step 5: Solve for x
   x = 72,809,267.56/9,360
6. Step 6: Final answer
   x = 7,778.77