Finding the Fourth Proportional to 1,111.68, 1,667.52 and 342.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.68 : 1,667.52 = 342.18 : x
2. Step 2: Convert to fraction form
   1,111.68/1,667.52 = 342.18/x
3. Step 3: Cross multiply
   1,111.68x = 1,667.52 × 342.18
4. Step 4: Simplify right side
   1,111.68x = 570,591.99
5. Step 5: Solve for x
   x = 570,591.99/1,111.68
6. Step 6: Final answer
   x = 513.27