Finding the Fourth Proportional to 3,779.48, 5,215.63 and 2,100.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,779.48 : 5,215.63 = 2,100.89 : x
2. Step 2: Convert to fraction form
   3,779.48/5,215.63 = 2,100.89/x
3. Step 3: Cross multiply
   3,779.48x = 5,215.63 × 2,100.89
4. Step 4: Simplify right side
   3,779.48x = 10,957,464.91
5. Step 5: Solve for x
   x = 10,957,464.91/3,779.48
6. Step 6: Final answer
   x = 2,899.20