Finding the Fourth Proportional to 22,768.94, 31,421.28 and 12,698.02

Step by Step Solution

1. Step 1: Write the proportion equation
   22,768.94 : 31,421.28 = 12,698.02 : x
2. Step 2: Convert to fraction form
   22,768.94/31,421.28 = 12,698.02/x
3. Step 3: Cross multiply
   22,768.94x = 31,421.28 × 12,698.02
4. Step 4: Simplify right side
   22,768.94x = 398,987,978.38
5. Step 5: Solve for x
   x = 398,987,978.38/22,768.94
6. Step 6: Final answer
   x = 17,523.34