Finding the Fourth Proportional to 22,910.78, 31,618.82 and 12,839.10

Step by Step Solution

1. Step 1: Write the proportion equation
   22,910.78 : 31,618.82 = 12,839.10 : x
2. Step 2: Convert to fraction form
   22,910.78/31,618.82 = 12,839.10/x
3. Step 3: Cross multiply
   22,910.78x = 31,618.82 × 12,839.10
4. Step 4: Simplify right side
   22,910.78x = 405,957,191.86
5. Step 5: Solve for x
   x = 405,957,191.86/22,910.78
6. Step 6: Final answer
   x = 17,719.05