Finding the Fourth Proportional to 22,417.72, 30,936.16 and 12,987.16

Step by Step Solution

1. Step 1: Write the proportion equation
   22,417.72 : 30,936.16 = 12,987.16 : x
2. Step 2: Convert to fraction form
   22,417.72/30,936.16 = 12,987.16/x
3. Step 3: Cross multiply
   22,417.72x = 30,936.16 × 12,987.16
4. Step 4: Simplify right side
   22,417.72x = 401,772,859.71
5. Step 5: Solve for x
   x = 401,772,859.71/22,417.72
6. Step 6: Final answer
   x = 17,922.11