Finding the Fourth Proportional to 21,669.50, 29,906.12 and 15,624.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,669.50 : 29,906.12 = 15,624.72 : x
2. Step 2: Convert to fraction form
   21,669.50/29,906.12 = 15,624.72/x
3. Step 3: Cross multiply
   21,669.50x = 29,906.12 × 15,624.72
4. Step 4: Simplify right side
   21,669.50x = 467,274,751.29
5. Step 5: Solve for x
   x = 467,274,751.29/21,669.50
6. Step 6: Final answer
   x = 21,563.71