Finding the Fourth Proportional to 31,987.82, 44,123.82 and 20,639.54

Step by Step Solution

1. Step 1: Write the proportion equation
   31,987.82 : 44,123.82 = 20,639.54 : x
2. Step 2: Convert to fraction form
   31,987.82/44,123.82 = 20,639.54/x
3. Step 3: Cross multiply
   31,987.82x = 44,123.82 × 20,639.54
4. Step 4: Simplify right side
   31,987.82x = 910,695,347.84
5. Step 5: Solve for x
   x = 910,695,347.84/31,987.82
6. Step 6: Final answer
   x = 28,470.07