Finding the Fourth Proportional to 1,185.12, 1,635.83 and 811.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.12 : 1,635.83 = 811.95 : x
2. Step 2: Convert to fraction form
   1,185.12/1,635.83 = 811.95/x
3. Step 3: Cross multiply
   1,185.12x = 1,635.83 × 811.95
4. Step 4: Simplify right side
   1,185.12x = 1,328,212.17
5. Step 5: Solve for x
   x = 1,328,212.17/1,185.12
6. Step 6: Final answer
   x = 1,120.74