Finding the Fourth Proportional to 21,078.74, 31,610.82 and 7,224.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,078.74 : 31,610.82 = 7,224.50 : x
2. Step 2: Convert to fraction form
   21,078.74/31,610.82 = 7,224.50/x
3. Step 3: Cross multiply
   21,078.74x = 31,610.82 × 7,224.50
4. Step 4: Simplify right side
   21,078.74x = 228,372,369.09
5. Step 5: Solve for x
   x = 228,372,369.09/21,078.74
6. Step 6: Final answer
   x = 10,834.25