Finding the Fourth Proportional to 22,678.56, 31,294.02 and 13,722.78

Step by Step Solution

1. Step 1: Write the proportion equation
   22,678.56 : 31,294.02 = 13,722.78 : x
2. Step 2: Convert to fraction form
   22,678.56/31,294.02 = 13,722.78/x
3. Step 3: Cross multiply
   22,678.56x = 31,294.02 × 13,722.78
4. Step 4: Simplify right side
   22,678.56x = 429,440,951.78
5. Step 5: Solve for x
   x = 429,440,951.78/22,678.56
6. Step 6: Final answer
   x = 18,935.99