Finding the Fourth Proportional to 8,685.56, 13,028.16 and 2,111.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,685.56 : 13,028.16 = 2,111.78 : x
2. Step 2: Convert to fraction form
   8,685.56/13,028.16 = 2,111.78/x
3. Step 3: Cross multiply
   8,685.56x = 13,028.16 × 2,111.78
4. Step 4: Simplify right side
   8,685.56x = 27,512,607.72
5. Step 5: Solve for x
   x = 27,512,607.72/8,685.56
6. Step 6: Final answer
   x = 3,167.63