Finding the Fourth Proportional to 31,559.51, 43,554.72 and 18,133.35

Step by Step Solution

1. Step 1: Write the proportion equation
   31,559.51 : 43,554.72 = 18,133.35 : x
2. Step 2: Convert to fraction form
   31,559.51/43,554.72 = 18,133.35/x
3. Step 3: Cross multiply
   31,559.51x = 43,554.72 × 18,133.35
4. Step 4: Simplify right side
   31,559.51x = 789,792,981.91
5. Step 5: Solve for x
   x = 789,792,981.91/31,559.51
6. Step 6: Final answer
   x = 25,025.52