Finding the Fourth Proportional to 2,615.59, 3,923.52 and 667.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.59 : 3,923.52 = 667.81 : x
2. Step 2: Convert to fraction form
   2,615.59/3,923.52 = 667.81/x
3. Step 3: Cross multiply
   2,615.59x = 3,923.52 × 667.81
4. Step 4: Simplify right side
   2,615.59x = 2,620,165.89
5. Step 5: Solve for x
   x = 2,620,165.89/2,615.59
6. Step 6: Final answer
   x = 1,001.75