Finding the Fourth Proportional to 9,404.60, 12,978.28 and 5,425.68

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.60 : 12,978.28 = 5,425.68 : x
2. Step 2: Convert to fraction form
   9,404.60/12,978.28 = 5,425.68/x
3. Step 3: Cross multiply
   9,404.60x = 12,978.28 × 5,425.68
4. Step 4: Simplify right side
   9,404.60x = 70,415,994.23
5. Step 5: Solve for x
   x = 70,415,994.23/9,404.60
6. Step 6: Final answer
   x = 7,487.40