Finding the Fourth Proportional to 30,949.31, 42,719.78 and 19,771.31

Step by Step Solution

1. Step 1: Write the proportion equation
   30,949.31 : 42,719.78 = 19,771.31 : x
2. Step 2: Convert to fraction form
   30,949.31/42,719.78 = 19,771.31/x
3. Step 3: Cross multiply
   30,949.31x = 42,719.78 × 19,771.31
4. Step 4: Simplify right side
   30,949.31x = 844,626,169.74
5. Step 5: Solve for x
   x = 844,626,169.74/30,949.31
6. Step 6: Final answer
   x = 27,290.63