Finding the Fourth Proportional to 2,615.15, 3,922.72 and 667.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.15 : 3,922.72 = 667.35 : x
2. Step 2: Convert to fraction form
   2,615.15/3,922.72 = 667.35/x
3. Step 3: Cross multiply
   2,615.15x = 3,922.72 × 667.35
4. Step 4: Simplify right side
   2,615.15x = 2,617,827.19
5. Step 5: Solve for x
   x = 2,617,827.19/2,615.15
6. Step 6: Final answer
   x = 1,001.02