Finding the Fourth Proportional to 9,405.18, 12,980.46 and 5,426.22

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.18 : 12,980.46 = 5,426.22 : x
2. Step 2: Convert to fraction form
   9,405.18/12,980.46 = 5,426.22/x
3. Step 3: Cross multiply
   9,405.18x = 12,980.46 × 5,426.22
4. Step 4: Simplify right side
   9,405.18x = 70,434,831.66
5. Step 5: Solve for x
   x = 70,434,831.66/9,405.18
6. Step 6: Final answer
   x = 7,488.94