Finding the Fourth Proportional to 31,150.73, 42,987.71 and 19,209.29

Step by Step Solution

1. Step 1: Write the proportion equation
   31,150.73 : 42,987.71 = 19,209.29 : x
2. Step 2: Convert to fraction form
   31,150.73/42,987.71 = 19,209.29/x
3. Step 3: Cross multiply
   31,150.73x = 42,987.71 × 19,209.29
4. Step 4: Simplify right side
   31,150.73x = 825,763,220.91
5. Step 5: Solve for x
   x = 825,763,220.91/31,150.73
6. Step 6: Final answer
   x = 26,508.64