Finding the Fourth Proportional to 9,406.28, 12,980.72 and 5,427.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,406.28 : 12,980.72 = 5,427.56 : x
2. Step 2: Convert to fraction form
   9,406.28/12,980.72 = 5,427.56/x
3. Step 3: Cross multiply
   9,406.28x = 12,980.72 × 5,427.56
4. Step 4: Simplify right side
   9,406.28x = 70,453,636.64
5. Step 5: Solve for x
   x = 70,453,636.64/9,406.28
6. Step 6: Final answer
   x = 7,490.06