Finding the Fourth Proportional to 9,016.16, 12,438.60 and 5,478.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,016.16 : 12,438.60 = 5,478.80 : x
2. Step 2: Convert to fraction form
   9,016.16/12,438.60 = 5,478.80/x
3. Step 3: Cross multiply
   9,016.16x = 12,438.60 × 5,478.80
4. Step 4: Simplify right side
   9,016.16x = 68,148,601.68
5. Step 5: Solve for x
   x = 68,148,601.68/9,016.16
6. Step 6: Final answer
   x = 7,558.50