Finding the Fourth Proportional to 21,780.16, 30,073.55 and 16,736.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,780.16 : 30,073.55 = 16,736.43 : x
2. Step 2: Convert to fraction form
   21,780.16/30,073.55 = 16,736.43/x
3. Step 3: Cross multiply
   21,780.16x = 30,073.55 × 16,736.43
4. Step 4: Simplify right side
   21,780.16x = 503,323,864.43
5. Step 5: Solve for x
   x = 503,323,864.43/21,780.16
6. Step 6: Final answer
   x = 23,109.28