Finding the Fourth Proportional to 12,087.92, 18,128.04 and 3,878

Step by Step Solution

1. Step 1: Write the proportion equation
   12,087.92 : 18,128.04 = 3,878 : x
2. Step 2: Convert to fraction form
   12,087.92/18,128.04 = 3,878/x
3. Step 3: Cross multiply
   12,087.92x = 18,128.04 × 3,878
4. Step 4: Simplify right side
   12,087.92x = 70,300,539.12
5. Step 5: Solve for x
   x = 70,300,539.12/12,087.92
6. Step 6: Final answer
   x = 5,815.77