Finding the Fourth Proportional to 21,016.38, 31,521.60 and 6,224.70

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.38 : 31,521.60 = 6,224.70 : x
2. Step 2: Convert to fraction form
   21,016.38/31,521.60 = 6,224.70/x
3. Step 3: Cross multiply
   21,016.38x = 31,521.60 × 6,224.70
4. Step 4: Simplify right side
   21,016.38x = 196,212,503.52
5. Step 5: Solve for x
   x = 196,212,503.52/21,016.38
6. Step 6: Final answer
   x = 9,336.17