Finding the Fourth Proportional to 9,407.31, 12,982.49 and 5,428.41

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407.31 : 12,982.49 = 5,428.41 : x
2. Step 2: Convert to fraction form
   9,407.31/12,982.49 = 5,428.41/x
3. Step 3: Cross multiply
   9,407.31x = 12,982.49 × 5,428.41
4. Step 4: Simplify right side
   9,407.31x = 70,474,278.54
5. Step 5: Solve for x
   x = 70,474,278.54/9,407.31
6. Step 6: Final answer
   x = 7,491.44