Finding the Fourth Proportional to 1,111.76, 1,667.92 and 342.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.76 : 1,667.92 = 342.24 : x
2. Step 2: Convert to fraction form
   1,111.76/1,667.92 = 342.24/x
3. Step 3: Cross multiply
   1,111.76x = 1,667.92 × 342.24
4. Step 4: Simplify right side
   1,111.76x = 570,828.94
5. Step 5: Solve for x
   x = 570,828.94/1,111.76
6. Step 6: Final answer
   x = 513.45