Finding the Fourth Proportional to 21,003.69, 31,453.83 and 13,585.44

Step by Step Solution

1. Step 1: Write the proportion equation
   21,003.69 : 31,453.83 = 13,585.44 : x
2. Step 2: Convert to fraction form
   21,003.69/31,453.83 = 13,585.44/x
3. Step 3: Cross multiply
   21,003.69x = 31,453.83 × 13,585.44
4. Step 4: Simplify right side
   21,003.69x = 427,314,120.24
5. Step 5: Solve for x
   x = 427,314,120.24/21,003.69
6. Step 6: Final answer
   x = 20,344.72