Finding the Fourth Proportional to 1,278.33, 1,763.69 and 806.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,278.33 : 1,763.69 = 806.10 : x
2. Step 2: Convert to fraction form
   1,278.33/1,763.69 = 806.10/x
3. Step 3: Cross multiply
   1,278.33x = 1,763.69 × 806.10
4. Step 4: Simplify right side
   1,278.33x = 1,421,706.48
5. Step 5: Solve for x
   x = 1,421,706.48/1,278.33
6. Step 6: Final answer
   x = 1,112.16