Finding the Fourth Proportional to 22,768.30, 31,420.12 and 12,696.86

Step by Step Solution

1. Step 1: Write the proportion equation
   22,768.30 : 31,420.12 = 12,696.86 : x
2. Step 2: Convert to fraction form
   22,768.30/31,420.12 = 12,696.86/x
3. Step 3: Cross multiply
   22,768.30x = 31,420.12 × 12,696.86
4. Step 4: Simplify right side
   22,768.30x = 398,936,864.82
5. Step 5: Solve for x
   x = 398,936,864.82/22,768.30
6. Step 6: Final answer
   x = 17,521.59