Finding the Fourth Proportional to 1,947.16, 2,687.85 and 1,317.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.16 : 2,687.85 = 1,317.38 : x
2. Step 2: Convert to fraction form
   1,947.16/2,687.85 = 1,317.38/x
3. Step 3: Cross multiply
   1,947.16x = 2,687.85 × 1,317.38
4. Step 4: Simplify right side
   1,947.16x = 3,540,919.83
5. Step 5: Solve for x
   x = 3,540,919.83/1,947.16
6. Step 6: Final answer
   x = 1,818.50