Finding the Fourth Proportional to 13,707.69, 18,916.46 and 7,739.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,707.69 : 18,916.46 = 7,739.61 : x
2. Step 2: Convert to fraction form
   13,707.69/18,916.46 = 7,739.61/x
3. Step 3: Cross multiply
   13,707.69x = 18,916.46 × 7,739.61
4. Step 4: Simplify right side
   13,707.69x = 146,406,022.98
5. Step 5: Solve for x
   x = 146,406,022.98/13,707.69
6. Step 6: Final answer
   x = 10,680.58