Finding the Fourth Proportional to 1,336.71, 1,843.79 and 813.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,336.71 : 1,843.79 = 813.05 : x
2. Step 2: Convert to fraction form
   1,336.71/1,843.79 = 813.05/x
3. Step 3: Cross multiply
   1,336.71x = 1,843.79 × 813.05
4. Step 4: Simplify right side
   1,336.71x = 1,499,080.18
5. Step 5: Solve for x
   x = 1,499,080.18/1,336.71
6. Step 6: Final answer
   x = 1,121.47