Finding the Fourth Proportional to 42,853.59, 64,288.22 and 13,269.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,853.59 : 64,288.22 = 13,269.42 : x
2. Step 2: Convert to fraction form
   42,853.59/64,288.22 = 13,269.42/x
3. Step 3: Cross multiply
   42,853.59x = 64,288.22 × 13,269.42
4. Step 4: Simplify right side
   42,853.59x = 853,067,325.89
5. Step 5: Solve for x
   x = 853,067,325.89/42,853.59
6. Step 6: Final answer
   x = 19,906.55