Finding the Fourth Proportional to 3,781.89, 5,218.91 and 2,103.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,781.89 : 5,218.91 = 2,103.30 : x
2. Step 2: Convert to fraction form
   3,781.89/5,218.91 = 2,103.30/x
3. Step 3: Cross multiply
   3,781.89x = 5,218.91 × 2,103.30
4. Step 4: Simplify right side
   3,781.89x = 10,976,922.89
5. Step 5: Solve for x
   x = 10,976,922.89/3,781.89
6. Step 6: Final answer
   x = 2,902.50