Finding the Fourth Proportional to 9,406.24, 12,981.20 and 5,428.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,406.24 : 12,981.20 = 5,428.08 : x
2. Step 2: Convert to fraction form
   9,406.24/12,981.20 = 5,428.08/x
3. Step 3: Cross multiply
   9,406.24x = 12,981.20 × 5,428.08
4. Step 4: Simplify right side
   9,406.24x = 70,462,992.10
5. Step 5: Solve for x
   x = 70,462,992.10/9,406.24
6. Step 6: Final answer
   x = 7,491.09