Finding the Fourth Proportional to 10,639.72, 15,953.82 and 3,709

Step by Step Solution

1. Step 1: Write the proportion equation
   10,639.72 : 15,953.82 = 3,709 : x
2. Step 2: Convert to fraction form
   10,639.72/15,953.82 = 3,709/x
3. Step 3: Cross multiply
   10,639.72x = 15,953.82 × 3,709
4. Step 4: Simplify right side
   10,639.72x = 59,172,718.38
5. Step 5: Solve for x
   x = 59,172,718.38/10,639.72
6. Step 6: Final answer
   x = 5,561.49