Finding the Fourth Proportional to 9,117.99, 12,581.04 and 5,578.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,117.99 : 12,581.04 = 5,578.69 : x
2. Step 2: Convert to fraction form
   9,117.99/12,581.04 = 5,578.69/x
3. Step 3: Cross multiply
   9,117.99x = 12,581.04 × 5,578.69
4. Step 4: Simplify right side
   9,117.99x = 70,185,722.04
5. Step 5: Solve for x
   x = 70,185,722.04/9,117.99
6. Step 6: Final answer
   x = 7,697.50