Finding the Fourth Proportional to 1,436.17, 2,150.78 and 818

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.17 : 2,150.78 = 818 : x
2. Step 2: Convert to fraction form
   1,436.17/2,150.78 = 818/x
3. Step 3: Cross multiply
   1,436.17x = 2,150.78 × 818
4. Step 4: Simplify right side
   1,436.17x = 1,759,338.04
5. Step 5: Solve for x
   x = 1,759,338.04/1,436.17
6. Step 6: Final answer
   x = 1,225.02