Finding the Fourth Proportional to 31,720.37, 43,754.32 and 20,404.63

Step by Step Solution

1. Step 1: Write the proportion equation
   31,720.37 : 43,754.32 = 20,404.63 : x
2. Step 2: Convert to fraction form
   31,720.37/43,754.32 = 20,404.63/x
3. Step 3: Cross multiply
   31,720.37x = 43,754.32 × 20,404.63
4. Step 4: Simplify right side
   31,720.37x = 892,790,550.10
5. Step 5: Solve for x
   x = 892,790,550.10/31,720.37
6. Step 6: Final answer
   x = 28,145.65