Finding the Fourth Proportional to 9,578.76, 13,218.55 and 5,387.01

Step by Step Solution

1. Step 1: Write the proportion equation
   9,578.76 : 13,218.55 = 5,387.01 : x
2. Step 2: Convert to fraction form
   9,578.76/13,218.55 = 5,387.01/x
3. Step 3: Cross multiply
   9,578.76x = 13,218.55 × 5,387.01
4. Step 4: Simplify right side
   9,578.76x = 71,208,461.04
5. Step 5: Solve for x
   x = 71,208,461.04/9,578.76
6. Step 6: Final answer
   x = 7,434.00