Finding the Fourth Proportional to 2,878.42, 3,971.54 and 2,091.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,878.42 : 3,971.54 = 2,091.10 : x
2. Step 2: Convert to fraction form
   2,878.42/3,971.54 = 2,091.10/x
3. Step 3: Cross multiply
   2,878.42x = 3,971.54 × 2,091.10
4. Step 4: Simplify right side
   2,878.42x = 8,304,887.29
5. Step 5: Solve for x
   x = 8,304,887.29/2,878.42
6. Step 6: Final answer
   x = 2,885.22