Finding the Fourth Proportional to 1,112.69, 1,667.58 and 818.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.69 : 1,667.58 = 818.82 : x
2. Step 2: Convert to fraction form
   1,112.69/1,667.58 = 818.82/x
3. Step 3: Cross multiply
   1,112.69x = 1,667.58 × 818.82
4. Step 4: Simplify right side
   1,112.69x = 1,365,439.04
5. Step 5: Solve for x
   x = 1,365,439.04/1,112.69
6. Step 6: Final answer
   x = 1,227.15