Finding the Fourth Proportional to 21,185.87, 31,789.23 and 14,985.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,185.87 : 31,789.23 = 14,985.72 : x
2. Step 2: Convert to fraction form
   21,185.87/31,789.23 = 14,985.72/x
3. Step 3: Cross multiply
   21,185.87x = 31,789.23 × 14,985.72
4. Step 4: Simplify right side
   21,185.87x = 476,384,499.80
5. Step 5: Solve for x
   x = 476,384,499.80/21,185.87
6. Step 6: Final answer
   x = 22,485.96