Finding the Fourth Proportional to 1,111.34, 1,667.82 and 418.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.34 : 1,667.82 = 418.17 : x
2. Step 2: Convert to fraction form
   1,111.34/1,667.82 = 418.17/x
3. Step 3: Cross multiply
   1,111.34x = 1,667.82 × 418.17
4. Step 4: Simplify right side
   1,111.34x = 697,432.29
5. Step 5: Solve for x
   x = 697,432.29/1,111.34
6. Step 6: Final answer
   x = 627.56