Finding the Fourth Proportional to 22,768.56, 31,420.48 and 12,696.88

Step by Step Solution

1. Step 1: Write the proportion equation
   22,768.56 : 31,420.48 = 12,696.88 : x
2. Step 2: Convert to fraction form
   22,768.56/31,420.48 = 12,696.88/x
3. Step 3: Cross multiply
   22,768.56x = 31,420.48 × 12,696.88
4. Step 4: Simplify right side
   22,768.56x = 398,942,064.10
5. Step 5: Solve for x
   x = 398,942,064.10/22,768.56
6. Step 6: Final answer
   x = 17,521.62