Finding the Fourth Proportional to 22,688.45, 31,310.82 and 12,479.91

Step by Step Solution

1. Step 1: Write the proportion equation
   22,688.45 : 31,310.82 = 12,479.91 : x
2. Step 2: Convert to fraction form
   22,688.45/31,310.82 = 12,479.91/x
3. Step 3: Cross multiply
   22,688.45x = 31,310.82 × 12,479.91
4. Step 4: Simplify right side
   22,688.45x = 390,756,274.33
5. Step 5: Solve for x
   x = 390,756,274.33/22,688.45
6. Step 6: Final answer
   x = 17,222.70