Finding the Fourth Proportional to 9,143.81, 12,609.73 and 5,559.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,143.81 : 12,609.73 = 5,559.38 : x
2. Step 2: Convert to fraction form
   9,143.81/12,609.73 = 5,559.38/x
3. Step 3: Cross multiply
   9,143.81x = 12,609.73 × 5,559.38
4. Step 4: Simplify right side
   9,143.81x = 70,102,311.61
5. Step 5: Solve for x
   x = 70,102,311.61/9,143.81
6. Step 6: Final answer
   x = 7,666.64