Finding the Fourth Proportional to 13,728.71, 18,946.59 and 7,760.43

Step by Step Solution

1. Step 1: Write the proportion equation
   13,728.71 : 18,946.59 = 7,760.43 : x
2. Step 2: Convert to fraction form
   13,728.71/18,946.59 = 7,760.43/x
3. Step 3: Cross multiply
   13,728.71x = 18,946.59 × 7,760.43
4. Step 4: Simplify right side
   13,728.71x = 147,033,685.43
5. Step 5: Solve for x
   x = 147,033,685.43/13,728.71
6. Step 6: Final answer
   x = 10,709.94