Finding the Fourth Proportional to 3,128.77, 4,685.22 and 1,878.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.77 : 4,685.22 = 1,878.59 : x
2. Step 2: Convert to fraction form
   3,128.77/4,685.22 = 1,878.59/x
3. Step 3: Cross multiply
   3,128.77x = 4,685.22 × 1,878.59
4. Step 4: Simplify right side
   3,128.77x = 8,801,619.15
5. Step 5: Solve for x
   x = 8,801,619.15/3,128.77
6. Step 6: Final answer
   x = 2,813.12