Finding the Fourth Proportional to 9,378.02, 12,942.28 and 5,399.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,378.02 : 12,942.28 = 5,399.06 : x
2. Step 2: Convert to fraction form
   9,378.02/12,942.28 = 5,399.06/x
3. Step 3: Cross multiply
   9,378.02x = 12,942.28 × 5,399.06
4. Step 4: Simplify right side
   9,378.02x = 69,876,146.26
5. Step 5: Solve for x
   x = 69,876,146.26/9,378.02
6. Step 6: Final answer
   x = 7,451.06