Finding the Fourth Proportional to 13,150.71, 19,706.49 and 12,824.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,150.71 : 19,706.49 = 12,824.69 : x
2. Step 2: Convert to fraction form
   13,150.71/19,706.49 = 12,824.69/x
3. Step 3: Cross multiply
   13,150.71x = 19,706.49 × 12,824.69
4. Step 4: Simplify right side
   13,150.71x = 252,729,526.71
5. Step 5: Solve for x
   x = 252,729,526.71/13,150.71
6. Step 6: Final answer
   x = 19,217.94