Finding the Fourth Proportional to 10,640.68, 15,963.90 and 3,715.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,640.68 : 15,963.90 = 3,715.72 : x
2. Step 2: Convert to fraction form
   10,640.68/15,963.90 = 3,715.72/x
3. Step 3: Cross multiply
   10,640.68x = 15,963.90 × 3,715.72
4. Step 4: Simplify right side
   10,640.68x = 59,317,382.51
5. Step 5: Solve for x
   x = 59,317,382.51/10,640.68
6. Step 6: Final answer
   x = 5,574.59