Finding the Fourth Proportional to 42,067.36, 63,112.38 and 13,991.95

Step by Step Solution

1. Step 1: Write the proportion equation
   42,067.36 : 63,112.38 = 13,991.95 : x
2. Step 2: Convert to fraction form
   42,067.36/63,112.38 = 13,991.95/x
3. Step 3: Cross multiply
   42,067.36x = 63,112.38 × 13,991.95
4. Step 4: Simplify right side
   42,067.36x = 883,065,265.34
5. Step 5: Solve for x
   x = 883,065,265.34/42,067.36
6. Step 6: Final answer
   x = 20,991.70