Finding the Fourth Proportional to 9,405.27, 12,980.65 and 5,425.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.27 : 12,980.65 = 5,425.60 : x
2. Step 2: Convert to fraction form
   9,405.27/12,980.65 = 5,425.60/x
3. Step 3: Cross multiply
   9,405.27x = 12,980.65 × 5,425.60
4. Step 4: Simplify right side
   9,405.27x = 70,427,814.64
5. Step 5: Solve for x
   x = 70,427,814.64/9,405.27
6. Step 6: Final answer
   x = 7,488.12