Finding the Fourth Proportional to 1,222.58, 1,834.54 and 811.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.58 : 1,834.54 = 811.92 : x
2. Step 2: Convert to fraction form
   1,222.58/1,834.54 = 811.92/x
3. Step 3: Cross multiply
   1,222.58x = 1,834.54 × 811.92
4. Step 4: Simplify right side
   1,222.58x = 1,489,499.72
5. Step 5: Solve for x
   x = 1,489,499.72/1,222.58
6. Step 6: Final answer
   x = 1,218.32