Finding the Fourth Proportional to 31,051.40, 42,879.39 and 19,724.54

Step by Step Solution

1. Step 1: Write the proportion equation
   31,051.40 : 42,879.39 = 19,724.54 : x
2. Step 2: Convert to fraction form
   31,051.40/42,879.39 = 19,724.54/x
3. Step 3: Cross multiply
   31,051.40x = 42,879.39 × 19,724.54
4. Step 4: Simplify right side
   31,051.40x = 845,776,028.83
5. Step 5: Solve for x
   x = 845,776,028.83/31,051.40
6. Step 6: Final answer
   x = 27,237.94