Finding the Fourth Proportional to 1,072.56, 1,608.89 and 342.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.56 : 1,608.89 = 342.12 : x
2. Step 2: Convert to fraction form
   1,072.56/1,608.89 = 342.12/x
3. Step 3: Cross multiply
   1,072.56x = 1,608.89 × 342.12
4. Step 4: Simplify right side
   1,072.56x = 550,433.45
5. Step 5: Solve for x
   x = 550,433.45/1,072.56
6. Step 6: Final answer
   x = 513.20