Finding the Fourth Proportional to 1,341.80, 1,851.81 and 810.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,341.80 : 1,851.81 = 810.95 : x
2. Step 2: Convert to fraction form
   1,341.80/1,851.81 = 810.95/x
3. Step 3: Cross multiply
   1,341.80x = 1,851.81 × 810.95
4. Step 4: Simplify right side
   1,341.80x = 1,501,719.96
5. Step 5: Solve for x
   x = 1,501,719.96/1,341.80
6. Step 6: Final answer
   x = 1,119.18