Finding the Fourth Proportional to 9,579.12, 13,218.12 and 5,386.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,579.12 : 13,218.12 = 5,386.56 : x
2. Step 2: Convert to fraction form
   9,579.12/13,218.12 = 5,386.56/x
3. Step 3: Cross multiply
   9,579.12x = 13,218.12 × 5,386.56
4. Step 4: Simplify right side
   9,579.12x = 71,200,196.47
5. Step 5: Solve for x
   x = 71,200,196.47/9,579.12
6. Step 6: Final answer
   x = 7,432.85