Finding the Fourth Proportional to 12,931.30, 17,840.62 and 8,457.67

Step by Step Solution

1. Step 1: Write the proportion equation
   12,931.30 : 17,840.62 = 8,457.67 : x
2. Step 2: Convert to fraction form
   12,931.30/17,840.62 = 8,457.67/x
3. Step 3: Cross multiply
   12,931.30x = 17,840.62 × 8,457.67
4. Step 4: Simplify right side
   12,931.30x = 150,890,076.56
5. Step 5: Solve for x
   x = 150,890,076.56/12,931.30
6. Step 6: Final answer
   x = 11,668.59