Finding the Fourth Proportional to 9,406.88, 12,978.54 and 5,427.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,406.88 : 12,978.54 = 5,427.48 : x
2. Step 2: Convert to fraction form
   9,406.88/12,978.54 = 5,427.48/x
3. Step 3: Cross multiply
   9,406.88x = 12,978.54 × 5,427.48
4. Step 4: Simplify right side
   9,406.88x = 70,440,766.28
5. Step 5: Solve for x
   x = 70,440,766.28/9,406.88
6. Step 6: Final answer
   x = 7,488.22