Finding the Fourth Proportional to 31.01, 42.77 and 19.94

Step by Step Solution

1. Step 1: Write the proportion equation
   31.01 : 42.77 = 19.94 : x
2. Step 2: Convert to fraction form
   31.01/42.77 = 19.94/x
3. Step 3: Cross multiply
   31.01x = 42.77 × 19.94
4. Step 4: Simplify right side
   31.01x = 852.52
5. Step 5: Solve for x
   x = 852.52/31.01
6. Step 6: Final answer
   x = 27.50