Finding the Fourth Proportional to 1,111.24, 1,667.10 and 418.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.24 : 1,667.10 = 418.12 : x
2. Step 2: Convert to fraction form
   1,111.24/1,667.10 = 418.12/x
3. Step 3: Cross multiply
   1,111.24x = 1,667.10 × 418.12
4. Step 4: Simplify right side
   1,111.24x = 697,047.85
5. Step 5: Solve for x
   x = 697,047.85/1,111.24
6. Step 6: Final answer
   x = 627.27