Finding the Fourth Proportional to 22,422.30, 30,933.27 and 12,987.42

Step by Step Solution

1. Step 1: Write the proportion equation
   22,422.30 : 30,933.27 = 12,987.42 : x
2. Step 2: Convert to fraction form
   22,422.30/30,933.27 = 12,987.42/x
3. Step 3: Cross multiply
   22,422.30x = 30,933.27 × 12,987.42
4. Step 4: Simplify right side
   22,422.30x = 401,743,369.46
5. Step 5: Solve for x
   x = 401,743,369.46/22,422.30
6. Step 6: Final answer
   x = 17,917.13