Finding the Fourth Proportional to 1,112.18, 1,667.78 and 342.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.18 : 1,667.78 = 342.26 : x
2. Step 2: Convert to fraction form
   1,112.18/1,667.78 = 342.26/x
3. Step 3: Cross multiply
   1,112.18x = 1,667.78 × 342.26
4. Step 4: Simplify right side
   1,112.18x = 570,806.90
5. Step 5: Solve for x
   x = 570,806.90/1,112.18
6. Step 6: Final answer
   x = 513.23