Finding the Fourth Proportional to 9,406.95, 12,982.20 and 5,428.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,406.95 : 12,982.20 = 5,428.23 : x
2. Step 2: Convert to fraction form
   9,406.95/12,982.20 = 5,428.23/x
3. Step 3: Cross multiply
   9,406.95x = 12,982.20 × 5,428.23
4. Step 4: Simplify right side
   9,406.95x = 70,470,367.51
5. Step 5: Solve for x
   x = 70,470,367.51/9,406.95
6. Step 6: Final answer
   x = 7,491.31