Finding the Fourth Proportional to 10,661.05, 15,991.46 and 3,640.98

Step by Step Solution

1. Step 1: Write the proportion equation
   10,661.05 : 15,991.46 = 3,640.98 : x
2. Step 2: Convert to fraction form
   10,661.05/15,991.46 = 3,640.98/x
3. Step 3: Cross multiply
   10,661.05x = 15,991.46 × 3,640.98
4. Step 4: Simplify right side
   10,661.05x = 58,224,567.83
5. Step 5: Solve for x
   x = 58,224,567.83/10,661.05
6. Step 6: Final answer
   x = 5,461.43