Finding the Fourth Proportional to 22,620.56, 31,216.38 and 12,684.56

Step by Step Solution

1. Step 1: Write the proportion equation
   22,620.56 : 31,216.38 = 12,684.56 : x
2. Step 2: Convert to fraction form
   22,620.56/31,216.38 = 12,684.56/x
3. Step 3: Cross multiply
   22,620.56x = 31,216.38 × 12,684.56
4. Step 4: Simplify right side
   22,620.56x = 395,966,045.09
5. Step 5: Solve for x
   x = 395,966,045.09/22,620.56
6. Step 6: Final answer
   x = 17,504.70