Finding the Fourth Proportional to 9,407.54, 12,982.88 and 5,215.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407.54 : 12,982.88 = 5,215.80 : x
2. Step 2: Convert to fraction form
   9,407.54/12,982.88 = 5,215.80/x
3. Step 3: Cross multiply
   9,407.54x = 12,982.88 × 5,215.80
4. Step 4: Simplify right side
   9,407.54x = 67,716,105.50
5. Step 5: Solve for x
   x = 67,716,105.50/9,407.54
6. Step 6: Final answer
   x = 7,198.07