Finding the Fourth Proportional to 2,520.89, 3,781.29 and 671.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.89 : 3,781.29 = 671.95 : x
2. Step 2: Convert to fraction form
   2,520.89/3,781.29 = 671.95/x
3. Step 3: Cross multiply
   2,520.89x = 3,781.29 × 671.95
4. Step 4: Simplify right side
   2,520.89x = 2,540,837.82
5. Step 5: Solve for x
   x = 2,540,837.82/2,520.89
6. Step 6: Final answer
   x = 1,007.91