Finding the Fourth Proportional to 2,615.72, 3,923.71 and 667.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.72 : 3,923.71 = 667.94 : x
2. Step 2: Convert to fraction form
   2,615.72/3,923.71 = 667.94/x
3. Step 3: Cross multiply
   2,615.72x = 3,923.71 × 667.94
4. Step 4: Simplify right side
   2,615.72x = 2,620,783.24
5. Step 5: Solve for x
   x = 2,620,783.24/2,615.72
6. Step 6: Final answer
   x = 1,001.94