Finding the Fourth Proportional to 31,145.90, 42,974.73 and 19,811.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,145.90 : 42,974.73 = 19,811.25 : x
2. Step 2: Convert to fraction form
   31,145.90/42,974.73 = 19,811.25/x
3. Step 3: Cross multiply
   31,145.90x = 42,974.73 × 19,811.25
4. Step 4: Simplify right side
   31,145.90x = 851,383,119.71
5. Step 5: Solve for x
   x = 851,383,119.71/31,145.90
6. Step 6: Final answer
   x = 27,335.32