Finding the Fourth Proportional to 31,067.78, 42,848.18 and 19,109.66

Step by Step Solution

1. Step 1: Write the proportion equation
   31,067.78 : 42,848.18 = 19,109.66 : x
2. Step 2: Convert to fraction form
   31,067.78/42,848.18 = 19,109.66/x
3. Step 3: Cross multiply
   31,067.78x = 42,848.18 × 19,109.66
4. Step 4: Simplify right side
   31,067.78x = 818,813,841.63
5. Step 5: Solve for x
   x = 818,813,841.63/31,067.78
6. Step 6: Final answer
   x = 26,355.73