Finding the Fourth Proportional to 3,419.89, 5,115.25 and 2,100.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,419.89 : 5,115.25 = 2,100.40 : x
2. Step 2: Convert to fraction form
   3,419.89/5,115.25 = 2,100.40/x
3. Step 3: Cross multiply
   3,419.89x = 5,115.25 × 2,100.40
4. Step 4: Simplify right side
   3,419.89x = 10,744,035.02
5. Step 5: Solve for x
   x = 10,744,035.02/3,419.89
6. Step 6: Final answer
   x = 3,141.64