Finding the Fourth Proportional to 3,863.31, 5,781.12 and 3,345.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,863.31 : 5,781.12 = 3,345.10 : x
2. Step 2: Convert to fraction form
   3,863.31/5,781.12 = 3,345.10/x
3. Step 3: Cross multiply
   3,863.31x = 5,781.12 × 3,345.10
4. Step 4: Simplify right side
   3,863.31x = 19,338,424.51
5. Step 5: Solve for x
   x = 19,338,424.51/3,863.31
6. Step 6: Final answer
   x = 5,005.66