Finding the Fourth Proportional to 3,779.13, 5,215.20 and 2,100.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,779.13 : 5,215.20 = 2,100.50 : x
2. Step 2: Convert to fraction form
   3,779.13/5,215.20 = 2,100.50/x
3. Step 3: Cross multiply
   3,779.13x = 5,215.20 × 2,100.50
4. Step 4: Simplify right side
   3,779.13x = 10,954,501.52
5. Step 5: Solve for x
   x = 10,954,501.52/3,779.13
6. Step 6: Final answer
   x = 2,898.68