Finding the Fourth Proportional to 12,915.76, 17,827.53 and 8,440.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915.76 : 17,827.53 = 8,440.24 : x
2. Step 2: Convert to fraction form
   12,915.76/17,827.53 = 8,440.24/x
3. Step 3: Cross multiply
   12,915.76x = 17,827.53 × 8,440.24
4. Step 4: Simplify right side
   12,915.76x = 150,468,631.81
5. Step 5: Solve for x
   x = 150,468,631.81/12,915.76
6. Step 6: Final answer
   x = 11,650.00