Finding the Fourth Proportional to 1,365.90, 1,885.22 and 806.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,365.90 : 1,885.22 = 806.15 : x
2. Step 2: Convert to fraction form
   1,365.90/1,885.22 = 806.15/x
3. Step 3: Cross multiply
   1,365.90x = 1,885.22 × 806.15
4. Step 4: Simplify right side
   1,365.90x = 1,519,770.10
5. Step 5: Solve for x
   x = 1,519,770.10/1,365.90
6. Step 6: Final answer
   x = 1,112.65