Finding the Fourth Proportional to 9,407.04, 12,981.78 and 5,215.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407.04 : 12,981.78 = 5,215.38 : x
2. Step 2: Convert to fraction form
   9,407.04/12,981.78 = 5,215.38/x
3. Step 3: Cross multiply
   9,407.04x = 12,981.78 × 5,215.38
4. Step 4: Simplify right side
   9,407.04x = 67,704,915.78
5. Step 5: Solve for x
   x = 67,704,915.78/9,407.04
6. Step 6: Final answer
   x = 7,197.26