Finding the Fourth Proportional to 22,989.69, 31,727.61 and 12,918.60

Step by Step Solution

1. Step 1: Write the proportion equation
   22,989.69 : 31,727.61 = 12,918.60 : x
2. Step 2: Convert to fraction form
   22,989.69/31,727.61 = 12,918.60/x
3. Step 3: Cross multiply
   22,989.69x = 31,727.61 × 12,918.60
4. Step 4: Simplify right side
   22,989.69x = 409,876,302.55
5. Step 5: Solve for x
   x = 409,876,302.55/22,989.69
6. Step 6: Final answer
   x = 17,828.70