Finding the Fourth Proportional to 3,111.15, 4,664.39 and 1,878.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.15 : 4,664.39 = 1,878.30 : x
2. Step 2: Convert to fraction form
   3,111.15/4,664.39 = 1,878.30/x
3. Step 3: Cross multiply
   3,111.15x = 4,664.39 × 1,878.30
4. Step 4: Simplify right side
   3,111.15x = 8,761,128.43
5. Step 5: Solve for x
   x = 8,761,128.43/3,111.15
6. Step 6: Final answer
   x = 2,816.04