Finding the Fourth Proportional to 9,406.89, 12,981.96 and 5,215.14

Step by Step Solution

1. Step 1: Write the proportion equation
   9,406.89 : 12,981.96 = 5,215.14 : x
2. Step 2: Convert to fraction form
   9,406.89/12,981.96 = 5,215.14/x
3. Step 3: Cross multiply
   9,406.89x = 12,981.96 × 5,215.14
4. Step 4: Simplify right side
   9,406.89x = 67,702,738.87
5. Step 5: Solve for x
   x = 67,702,738.87/9,406.89
6. Step 6: Final answer
   x = 7,197.14