Finding the Fourth Proportional to 9,155.52, 12,636.48 and 5,431.68

Step by Step Solution

1. Step 1: Write the proportion equation
   9,155.52 : 12,636.48 = 5,431.68 : x
2. Step 2: Convert to fraction form
   9,155.52/12,636.48 = 5,431.68/x
3. Step 3: Cross multiply
   9,155.52x = 12,636.48 × 5,431.68
4. Step 4: Simplify right side
   9,155.52x = 68,637,315.69
5. Step 5: Solve for x
   x = 68,637,315.69/9,155.52
6. Step 6: Final answer
   x = 7,496.82