Finding the Fourth Proportional to 9,378.59, 12,942.18 and 5,399.66

Step by Step Solution

1. Step 1: Write the proportion equation
   9,378.59 : 12,942.18 = 5,399.66 : x
2. Step 2: Convert to fraction form
   9,378.59/12,942.18 = 5,399.66/x
3. Step 3: Cross multiply
   9,378.59x = 12,942.18 × 5,399.66
4. Step 4: Simplify right side
   9,378.59x = 69,883,404.01
5. Step 5: Solve for x
   x = 69,883,404.01/9,378.59
6. Step 6: Final answer
   x = 7,451.38