Finding the Fourth Proportional to 22,418.72, 30,937.54 and 12,988.16

Step by Step Solution

1. Step 1: Write the proportion equation
   22,418.72 : 30,937.54 = 12,988.16 : x
2. Step 2: Convert to fraction form
   22,418.72/30,937.54 = 12,988.16/x
3. Step 3: Cross multiply
   22,418.72x = 30,937.54 × 12,988.16
4. Step 4: Simplify right side
   22,418.72x = 401,821,719.53
5. Step 5: Solve for x
   x = 401,821,719.53/22,418.72
6. Step 6: Final answer
   x = 17,923.49