Finding the Fourth Proportional to 2,667.38, 3,997.47 and 1,691.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,667.38 : 3,997.47 = 1,691.78 : x
2. Step 2: Convert to fraction form
   2,667.38/3,997.47 = 1,691.78/x
3. Step 3: Cross multiply
   2,667.38x = 3,997.47 × 1,691.78
4. Step 4: Simplify right side
   2,667.38x = 6,762,839.80
5. Step 5: Solve for x
   x = 6,762,839.80/2,667.38
6. Step 6: Final answer
   x = 2,535.39