Finding the Fourth Proportional to 9,221.36, 12,725.27 and 5,636.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,221.36 : 12,725.27 = 5,636.31 : x
2. Step 2: Convert to fraction form
   9,221.36/12,725.27 = 5,636.31/x
3. Step 3: Cross multiply
   9,221.36x = 12,725.27 × 5,636.31
4. Step 4: Simplify right side
   9,221.36x = 71,723,538.37
5. Step 5: Solve for x
   x = 71,723,538.37/9,221.36
6. Step 6: Final answer
   x = 7,777.98