Finding the Fourth Proportional to 1,112.90, 1,667.75 and 818.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.90 : 1,667.75 = 818.09 : x
2. Step 2: Convert to fraction form
   1,112.90/1,667.75 = 818.09/x
3. Step 3: Cross multiply
   1,112.90x = 1,667.75 × 818.09
4. Step 4: Simplify right side
   1,112.90x = 1,364,357.17
5. Step 5: Solve for x
   x = 1,364,357.17/1,112.90
6. Step 6: Final answer
   x = 1,225.95