Finding the Fourth Proportional to 1,111.52, 1,667.24 and 342

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.52 : 1,667.24 = 342 : x
2. Step 2: Convert to fraction form
   1,111.52/1,667.24 = 342/x
3. Step 3: Cross multiply
   1,111.52x = 1,667.24 × 342
4. Step 4: Simplify right side
   1,111.52x = 570,196.08
5. Step 5: Solve for x
   x = 570,196.08/1,111.52
6. Step 6: Final answer
   x = 512.99