Finding the Fourth Proportional to 13,857.16, 20,785.59 and 3,996.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,857.16 : 20,785.59 = 3,996.37 : x
2. Step 2: Convert to fraction form
   13,857.16/20,785.59 = 3,996.37/x
3. Step 3: Cross multiply
   13,857.16x = 20,785.59 × 3,996.37
4. Step 4: Simplify right side
   13,857.16x = 83,066,908.31
5. Step 5: Solve for x
   x = 83,066,908.31/13,857.16
6. Step 6: Final answer
   x = 5,994.51