Finding the Fourth Proportional to 3,779.35, 5,215.79 and 2,100.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,779.35 : 5,215.79 = 2,100.89 : x
2. Step 2: Convert to fraction form
   3,779.35/5,215.79 = 2,100.89/x
3. Step 3: Cross multiply
   3,779.35x = 5,215.79 × 2,100.89
4. Step 4: Simplify right side
   3,779.35x = 10,957,801.05
5. Step 5: Solve for x
   x = 10,957,801.05/3,779.35
6. Step 6: Final answer
   x = 2,899.39