Finding the Fourth Proportional to 31,631.80, 43,650.72 and 18,205.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,631.80 : 43,650.72 = 18,205.12 : x
2. Step 2: Convert to fraction form
   31,631.80/43,650.72 = 18,205.12/x
3. Step 3: Cross multiply
   31,631.80x = 43,650.72 × 18,205.12
4. Step 4: Simplify right side
   31,631.80x = 794,666,595.69
5. Step 5: Solve for x
   x = 794,666,595.69/31,631.80
6. Step 6: Final answer
   x = 25,122.40