Finding the Fourth Proportional to 22,423.79, 30,943.16 and 12,990.59

Step by Step Solution

1. Step 1: Write the proportion equation
   22,423.79 : 30,943.16 = 12,990.59 : x
2. Step 2: Convert to fraction form
   22,423.79/30,943.16 = 12,990.59/x
3. Step 3: Cross multiply
   22,423.79x = 30,943.16 × 12,990.59
4. Step 4: Simplify right side
   22,423.79x = 401,969,839.91
5. Step 5: Solve for x
   x = 401,969,839.91/22,423.79
6. Step 6: Final answer
   x = 17,926.04