Finding the Fourth Proportional to 1,947.76, 2,686.91 and 1,318.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.76 : 2,686.91 = 1,318.31 : x
2. Step 2: Convert to fraction form
   1,947.76/2,686.91 = 1,318.31/x
3. Step 3: Cross multiply
   1,947.76x = 2,686.91 × 1,318.31
4. Step 4: Simplify right side
   1,947.76x = 3,542,180.32
5. Step 5: Solve for x
   x = 3,542,180.32/1,947.76
6. Step 6: Final answer
   x = 1,818.59