Finding the Fourth Proportional to 9,407.08, 12,981.63 and 5,428.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407.08 : 12,981.63 = 5,428.54 : x
2. Step 2: Convert to fraction form
   9,407.08/12,981.63 = 5,428.54/x
3. Step 3: Cross multiply
   9,407.08x = 12,981.63 × 5,428.54
4. Step 4: Simplify right side
   9,407.08x = 70,471,297.72
5. Step 5: Solve for x
   x = 70,471,297.72/9,407.08
6. Step 6: Final answer
   x = 7,491.30