Finding the Fourth Proportional to 31,569.42, 43,564.32 and 18,131.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,569.42 : 43,564.32 = 18,131.20 : x
2. Step 2: Convert to fraction form
   31,569.42/43,564.32 = 18,131.20/x
3. Step 3: Cross multiply
   31,569.42x = 43,564.32 × 18,131.20
4. Step 4: Simplify right side
   31,569.42x = 789,873,398.78
5. Step 5: Solve for x
   x = 789,873,398.78/31,569.42
6. Step 6: Final answer
   x = 25,020.21