Finding the Fourth Proportional to 21,016.50, 31,529.07 and 8,704.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.50 : 31,529.07 = 8,704.50 : x
2. Step 2: Convert to fraction form
   21,016.50/31,529.07 = 8,704.50/x
3. Step 3: Cross multiply
   21,016.50x = 31,529.07 × 8,704.50
4. Step 4: Simplify right side
   21,016.50x = 274,444,789.82
5. Step 5: Solve for x
   x = 274,444,789.82/21,016.50
6. Step 6: Final answer
   x = 13,058.54