Finding the Fourth Proportional to 9,412.69, 12,989.76 and 5,163.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,412.69 : 12,989.76 = 5,163.94 : x
2. Step 2: Convert to fraction form
   9,412.69/12,989.76 = 5,163.94/x
3. Step 3: Cross multiply
   9,412.69x = 12,989.76 × 5,163.94
4. Step 4: Simplify right side
   9,412.69x = 67,078,341.25
5. Step 5: Solve for x
   x = 67,078,341.25/9,412.69
6. Step 6: Final answer
   x = 7,126.37