Finding the Fourth Proportional to 22,810.33, 31,478.79 and 12,738.25

Step by Step Solution

1. Step 1: Write the proportion equation
   22,810.33 : 31,478.79 = 12,738.25 : x
2. Step 2: Convert to fraction form
   22,810.33/31,478.79 = 12,738.25/x
3. Step 3: Cross multiply
   22,810.33x = 31,478.79 × 12,738.25
4. Step 4: Simplify right side
   22,810.33x = 400,984,696.72
5. Step 5: Solve for x
   x = 400,984,696.72/22,810.33
6. Step 6: Final answer
   x = 17,579.08