Finding the Fourth Proportional to 1,111.79, 1,667.67 and 342.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.79 : 1,667.67 = 342.29 : x
2. Step 2: Convert to fraction form
   1,111.79/1,667.67 = 342.29/x
3. Step 3: Cross multiply
   1,111.79x = 1,667.67 × 342.29
4. Step 4: Simplify right side
   1,111.79x = 570,818.43
5. Step 5: Solve for x
   x = 570,818.43/1,111.79
6. Step 6: Final answer
   x = 513.43