Finding the Fourth Proportional to 21,007.58, 28,987.83 and 14,216.45

Step by Step Solution

1. Step 1: Write the proportion equation
   21,007.58 : 28,987.83 = 14,216.45 : x
2. Step 2: Convert to fraction form
   21,007.58/28,987.83 = 14,216.45/x
3. Step 3: Cross multiply
   21,007.58x = 28,987.83 × 14,216.45
4. Step 4: Simplify right side
   21,007.58x = 412,103,890.86
5. Step 5: Solve for x
   x = 412,103,890.86/21,007.58
6. Step 6: Final answer
   x = 19,616.92