Finding the Fourth Proportional to 31,139.94, 42,960.87 and 19,806.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.94 : 42,960.87 = 19,806.42 : x
2. Step 2: Convert to fraction form
   31,139.94/42,960.87 = 19,806.42/x
3. Step 3: Cross multiply
   31,139.94x = 42,960.87 × 19,806.42
4. Step 4: Simplify right side
   31,139.94x = 850,901,034.79
5. Step 5: Solve for x
   x = 850,901,034.79/31,139.94
6. Step 6: Final answer
   x = 27,325.07