Finding the Fourth Proportional to 1,863.15, 2,791.71 and 985.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,863.15 : 2,791.71 = 985.61 : x
2. Step 2: Convert to fraction form
   1,863.15/2,791.71 = 985.61/x
3. Step 3: Cross multiply
   1,863.15x = 2,791.71 × 985.61
4. Step 4: Simplify right side
   1,863.15x = 2,751,523.33
5. Step 5: Solve for x
   x = 2,751,523.33/1,863.15
6. Step 6: Final answer
   x = 1,476.81