Finding the Fourth Proportional to 9,407.55, 12,982.23 and 5,428.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407.55 : 12,982.23 = 5,428.56 : x
2. Step 2: Convert to fraction form
   9,407.55/12,982.23 = 5,428.56/x
3. Step 3: Cross multiply
   9,407.55x = 12,982.23 × 5,428.56
4. Step 4: Simplify right side
   9,407.55x = 70,474,814.49
5. Step 5: Solve for x
   x = 70,474,814.49/9,407.55
6. Step 6: Final answer
   x = 7,491.30