Finding the Fourth Proportional to 42,783, 64,200.42 and 18,159

Step by Step Solution

1. Step 1: Write the proportion equation
   42,783 : 64,200.42 = 18,159 : x
2. Step 2: Convert to fraction form
   42,783/64,200.42 = 18,159/x
3. Step 3: Cross multiply
   42,783x = 64,200.42 × 18,159
4. Step 4: Simplify right side
   42,783x = 1,165,815,426.78
5. Step 5: Solve for x
   x = 1,165,815,426.78/42,783
6. Step 6: Final answer
   x = 27,249.50