Finding the Fourth Proportional to 1,335.47, 1,843.01 and 811.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.47 : 1,843.01 = 811.80 : x
2. Step 2: Convert to fraction form
   1,335.47/1,843.01 = 811.80/x
3. Step 3: Cross multiply
   1,335.47x = 1,843.01 × 811.80
4. Step 4: Simplify right side
   1,335.47x = 1,496,151.46
5. Step 5: Solve for x
   x = 1,496,151.46/1,335.47
6. Step 6: Final answer
   x = 1,120.32