Finding the Fourth Proportional to 3,781.34, 5,215.54 and 2,521.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,781.34 : 5,215.54 = 2,521.76 : x
2. Step 2: Convert to fraction form
   3,781.34/5,215.54 = 2,521.76/x
3. Step 3: Cross multiply
   3,781.34x = 5,215.54 × 2,521.76
4. Step 4: Simplify right side
   3,781.34x = 13,152,327.54
5. Step 5: Solve for x
   x = 13,152,327.54/3,781.34
6. Step 6: Final answer
   x = 3,478.22