Finding the Fourth Proportional to 1,917.98, 2,874.79 and 1,686.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917.98 : 2,874.79 = 1,686.42 : x
2. Step 2: Convert to fraction form
   1,917.98/2,874.79 = 1,686.42/x
3. Step 3: Cross multiply
   1,917.98x = 2,874.79 × 1,686.42
4. Step 4: Simplify right side
   1,917.98x = 4,848,105.46
5. Step 5: Solve for x
   x = 4,848,105.46/1,917.98
6. Step 6: Final answer
   x = 2,527.72