Finding the Fourth Proportional to 22,911.05, 31,618.15 and 12,839.58

Step by Step Solution

1. Step 1: Write the proportion equation
   22,911.05 : 31,618.15 = 12,839.58 : x
2. Step 2: Convert to fraction form
   22,911.05/31,618.15 = 12,839.58/x
3. Step 3: Cross multiply
   22,911.05x = 31,618.15 × 12,839.58
4. Step 4: Simplify right side
   22,911.05x = 405,963,734.28
5. Step 5: Solve for x
   x = 405,963,734.28/22,911.05
6. Step 6: Final answer
   x = 17,719.12