Finding the Fourth Proportional to 9,399.13, 12,967.86 and 5,419.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.13 : 12,967.86 = 5,419.71 : x
2. Step 2: Convert to fraction form
   9,399.13/12,967.86 = 5,419.71/x
3. Step 3: Cross multiply
   9,399.13x = 12,967.86 × 5,419.71
4. Step 4: Simplify right side
   9,399.13x = 70,282,040.52
5. Step 5: Solve for x
   x = 70,282,040.52/9,399.13
6. Step 6: Final answer
   x = 7,477.50