Finding the Fourth Proportional to 31,561.50, 43,556.26 and 18,136.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,561.50 : 43,556.26 = 18,136.96 : x
2. Step 2: Convert to fraction form
   31,561.50/43,556.26 = 18,136.96/x
3. Step 3: Cross multiply
   31,561.50x = 43,556.26 × 18,136.96
4. Step 4: Simplify right side
   31,561.50x = 789,978,145.37
5. Step 5: Solve for x
   x = 789,978,145.37/31,561.50
6. Step 6: Final answer
   x = 25,029.80