Finding the Fourth Proportional to 9,215.18, 12,715.67 and 5,181.46

Step by Step Solution

1. Step 1: Write the proportion equation
   9,215.18 : 12,715.67 = 5,181.46 : x
2. Step 2: Convert to fraction form
   9,215.18/12,715.67 = 5,181.46/x
3. Step 3: Cross multiply
   9,215.18x = 12,715.67 × 5,181.46
4. Step 4: Simplify right side
   9,215.18x = 65,885,735.48
5. Step 5: Solve for x
   x = 65,885,735.48/9,215.18
6. Step 6: Final answer
   x = 7,149.70