Finding the Fourth Proportional to 9,405.48, 12,979.36 and 5,426.32

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.48 : 12,979.36 = 5,426.32 : x
2. Step 2: Convert to fraction form
   9,405.48/12,979.36 = 5,426.32/x
3. Step 3: Cross multiply
   9,405.48x = 12,979.36 × 5,426.32
4. Step 4: Simplify right side
   9,405.48x = 70,430,160.76
5. Step 5: Solve for x
   x = 70,430,160.76/9,405.48
6. Step 6: Final answer
   x = 7,488.20