Finding the Fourth Proportional to 22,559.73, 31,131.72 and 12,999.35

Step by Step Solution

1. Step 1: Write the proportion equation
   22,559.73 : 31,131.72 = 12,999.35 : x
2. Step 2: Convert to fraction form
   22,559.73/31,131.72 = 12,999.35/x
3. Step 3: Cross multiply
   22,559.73x = 31,131.72 × 12,999.35
4. Step 4: Simplify right side
   22,559.73x = 404,691,968.72
5. Step 5: Solve for x
   x = 404,691,968.72/22,559.73
6. Step 6: Final answer
   x = 17,938.69