Finding the Fourth Proportional to 21,671.50, 29,908.88 and 15,626.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,671.50 : 29,908.88 = 15,626.72 : x
2. Step 2: Convert to fraction form
   21,671.50/29,908.88 = 15,626.72/x
3. Step 3: Cross multiply
   21,671.50x = 29,908.88 × 15,626.72
4. Step 4: Simplify right side
   21,671.50x = 467,377,693.27
5. Step 5: Solve for x
   x = 467,377,693.27/21,671.50
6. Step 6: Final answer
   x = 21,566.47