Finding the Fourth Proportional to 42,805.50, 64,234.20 and 18,181.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,805.50 : 64,234.20 = 18,181.50 : x
2. Step 2: Convert to fraction form
   42,805.50/64,234.20 = 18,181.50/x
3. Step 3: Cross multiply
   42,805.50x = 64,234.20 × 18,181.50
4. Step 4: Simplify right side
   42,805.50x = 1,167,874,107.30
5. Step 5: Solve for x
   x = 1,167,874,107.30/42,805.50
6. Step 6: Final answer
   x = 27,283.27