Finding the Fourth Proportional to 3,779.61, 5,215.23 and 2,100.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,779.61 : 5,215.23 = 2,100.96 : x
2. Step 2: Convert to fraction form
   3,779.61/5,215.23 = 2,100.96/x
3. Step 3: Cross multiply
   3,779.61x = 5,215.23 × 2,100.96
4. Step 4: Simplify right side
   3,779.61x = 10,956,989.62
5. Step 5: Solve for x
   x = 10,956,989.62/3,779.61
6. Step 6: Final answer
   x = 2,898.97