Finding the Fourth Proportional to 22,929.30, 31,643.73 and 12,857.22

Step by Step Solution

1. Step 1: Write the proportion equation
   22,929.30 : 31,643.73 = 12,857.22 : x
2. Step 2: Convert to fraction form
   22,929.30/31,643.73 = 12,857.22/x
3. Step 3: Cross multiply
   22,929.30x = 31,643.73 × 12,857.22
4. Step 4: Simplify right side
   22,929.30x = 406,850,398.23
5. Step 5: Solve for x
   x = 406,850,398.23/22,929.30
6. Step 6: Final answer
   x = 17,743.69