Finding the Fourth Proportional to 31,791.49, 43,870.21 and 19,854.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,791.49 : 43,870.21 = 19,854.12 : x
2. Step 2: Convert to fraction form
   31,791.49/43,870.21 = 19,854.12/x
3. Step 3: Cross multiply
   31,791.49x = 43,870.21 × 19,854.12
4. Step 4: Simplify right side
   31,791.49x = 871,004,413.77
5. Step 5: Solve for x
   x = 871,004,413.77/31,791.49
6. Step 6: Final answer
   x = 27,397.41