Finding the Fourth Proportional to 9,407.18, 12,981.71 and 5,215.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407.18 : 12,981.71 = 5,215.34 : x
2. Step 2: Convert to fraction form
   9,407.18/12,981.71 = 5,215.34/x
3. Step 3: Cross multiply
   9,407.18x = 12,981.71 × 5,215.34
4. Step 4: Simplify right side
   9,407.18x = 67,704,031.43
5. Step 5: Solve for x
   x = 67,704,031.43/9,407.18
6. Step 6: Final answer
   x = 7,197.06