Finding the Fourth Proportional to 9,378.75, 12,942.89 and 5,399.22

Step by Step Solution

1. Step 1: Write the proportion equation
   9,378.75 : 12,942.89 = 5,399.22 : x
2. Step 2: Convert to fraction form
   9,378.75/12,942.89 = 5,399.22/x
3. Step 3: Cross multiply
   9,378.75x = 12,942.89 × 5,399.22
4. Step 4: Simplify right side
   9,378.75x = 69,881,483.55
5. Step 5: Solve for x
   x = 69,881,483.55/9,378.75
6. Step 6: Final answer
   x = 7,451.04