Finding the Fourth Proportional to 31,442.37, 43,377.89 and 20,109.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,442.37 : 43,377.89 = 20,109.25 : x
2. Step 2: Convert to fraction form
   31,442.37/43,377.89 = 20,109.25/x
3. Step 3: Cross multiply
   31,442.37x = 43,377.89 × 20,109.25
4. Step 4: Simplify right side
   31,442.37x = 872,296,834.48
5. Step 5: Solve for x
   x = 872,296,834.48/31,442.37
6. Step 6: Final answer
   x = 27,742.72