Finding the Fourth Proportional to 42,973.87, 64,418.89 and 18,021.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,973.87 : 64,418.89 = 18,021.42 : x
2. Step 2: Convert to fraction form
   42,973.87/64,418.89 = 18,021.42/x
3. Step 3: Cross multiply
   42,973.87x = 64,418.89 × 18,021.42
4. Step 4: Simplify right side
   42,973.87x = 1,160,919,872.62
5. Step 5: Solve for x
   x = 1,160,919,872.62/42,973.87
6. Step 6: Final answer
   x = 27,014.55