Finding the Fourth Proportional to 9,426.87, 13,007.63 and 5,447.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,426.87 : 13,007.63 = 5,447.21 : x
2. Step 2: Convert to fraction form
   9,426.87/13,007.63 = 5,447.21/x
3. Step 3: Cross multiply
   9,426.87x = 13,007.63 × 5,447.21
4. Step 4: Simplify right side
   9,426.87x = 70,855,199.94
5. Step 5: Solve for x
   x = 70,855,199.94/9,426.87
6. Step 6: Final answer
   x = 7,516.31