Finding the Fourth Proportional to 9,478.56, 13,079.60 and 5,286.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,478.56 : 13,079.60 = 5,286.48 : x
2. Step 2: Convert to fraction form
   9,478.56/13,079.60 = 5,286.48/x
3. Step 3: Cross multiply
   9,478.56x = 13,079.60 × 5,286.48
4. Step 4: Simplify right side
   9,478.56x = 69,145,043.81
5. Step 5: Solve for x
   x = 69,145,043.81/9,478.56
6. Step 6: Final answer
   x = 7,294.89