Finding the Fourth Proportional to 31,113.79, 42,936.69 and 19,014.28

Step by Step Solution

1. Step 1: Write the proportion equation
   31,113.79 : 42,936.69 = 19,014.28 : x
2. Step 2: Convert to fraction form
   31,113.79/42,936.69 = 19,014.28/x
3. Step 3: Cross multiply
   31,113.79x = 42,936.69 × 19,014.28
4. Step 4: Simplify right side
   31,113.79x = 816,410,245.93
5. Step 5: Solve for x
   x = 816,410,245.93/31,113.79
6. Step 6: Final answer
   x = 26,239.50