Finding the Fourth Proportional to 21,204.69, 31,802.18 and 9,521.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,204.69 : 31,802.18 = 9,521.25 : x
2. Step 2: Convert to fraction form
   21,204.69/31,802.18 = 9,521.25/x
3. Step 3: Cross multiply
   21,204.69x = 31,802.18 × 9,521.25
4. Step 4: Simplify right side
   21,204.69x = 302,796,458.72
5. Step 5: Solve for x
   x = 302,796,458.72/21,204.69
6. Step 6: Final answer
   x = 14,279.69