Finding the Fourth Proportional to 13,384.81, 18,469.14 and 7,718.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,384.81 : 18,469.14 = 7,718.72 : x
2. Step 2: Convert to fraction form
   13,384.81/18,469.14 = 7,718.72/x
3. Step 3: Cross multiply
   13,384.81x = 18,469.14 × 7,718.72
4. Step 4: Simplify right side
   13,384.81x = 142,558,120.30
5. Step 5: Solve for x
   x = 142,558,120.30/13,384.81
6. Step 6: Final answer
   x = 10,650.74