Finding the Fourth Proportional to 21,016.37, 31,503.29 and 13,625.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.37 : 31,503.29 = 13,625.53 : x
2. Step 2: Convert to fraction form
   21,016.37/31,503.29 = 13,625.53/x
3. Step 3: Cross multiply
   21,016.37x = 31,503.29 × 13,625.53
4. Step 4: Simplify right side
   21,016.37x = 429,249,022.99
5. Step 5: Solve for x
   x = 429,249,022.99/21,016.37
6. Step 6: Final answer
   x = 20,424.51