Finding the Fourth Proportional to 21,942.39, 30,272.61 and 12,505.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,942.39 : 30,272.61 = 12,505.50 : x
2. Step 2: Convert to fraction form
   21,942.39/30,272.61 = 12,505.50/x
3. Step 3: Cross multiply
   21,942.39x = 30,272.61 × 12,505.50
4. Step 4: Simplify right side
   21,942.39x = 378,574,124.36
5. Step 5: Solve for x
   x = 378,574,124.36/21,942.39
6. Step 6: Final answer
   x = 17,253.09