Finding the Fourth Proportional to 31,609.18, 43,621.92 and 18,180.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,609.18 : 43,621.92 = 18,180.42 : x
2. Step 2: Convert to fraction form
   31,609.18/43,621.92 = 18,180.42/x
3. Step 3: Cross multiply
   31,609.18x = 43,621.92 × 18,180.42
4. Step 4: Simplify right side
   31,609.18x = 793,064,826.81
5. Step 5: Solve for x
   x = 793,064,826.81/31,609.18
6. Step 6: Final answer
   x = 25,089.70