Finding the Fourth Proportional to 1,333.35, 1,998.41 and 811.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,333.35 : 1,998.41 = 811.71 : x
2. Step 2: Convert to fraction form
   1,333.35/1,998.41 = 811.71/x
3. Step 3: Cross multiply
   1,333.35x = 1,998.41 × 811.71
4. Step 4: Simplify right side
   1,333.35x = 1,622,125.32
5. Step 5: Solve for x
   x = 1,622,125.32/1,333.35
6. Step 6: Final answer
   x = 1,216.58