Finding the Fourth Proportional to 21,770.14, 30,045.76 and 12,339.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,770.14 : 30,045.76 = 12,339.31 : x
2. Step 2: Convert to fraction form
   21,770.14/30,045.76 = 12,339.31/x
3. Step 3: Cross multiply
   21,770.14x = 30,045.76 × 12,339.31
4. Step 4: Simplify right side
   21,770.14x = 370,743,946.83
5. Step 5: Solve for x
   x = 370,743,946.83/21,770.14
6. Step 6: Final answer
   x = 17,029.93