Finding the Fourth Proportional to 9,399.33, 12,972.45 and 5,419.66

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.33 : 12,972.45 = 5,419.66 : x
2. Step 2: Convert to fraction form
   9,399.33/12,972.45 = 5,419.66/x
3. Step 3: Cross multiply
   9,399.33x = 12,972.45 × 5,419.66
4. Step 4: Simplify right side
   9,399.33x = 70,306,268.37
5. Step 5: Solve for x
   x = 70,306,268.37/9,399.33
6. Step 6: Final answer
   x = 7,479.92