Finding the Fourth Proportional to 3,390.89, 4,680.84 and 2,065.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,390.89 : 4,680.84 = 2,065.05 : x
2. Step 2: Convert to fraction form
   3,390.89/4,680.84 = 2,065.05/x
3. Step 3: Cross multiply
   3,390.89x = 4,680.84 × 2,065.05
4. Step 4: Simplify right side
   3,390.89x = 9,666,168.64
5. Step 5: Solve for x
   x = 9,666,168.64/3,390.89
6. Step 6: Final answer
   x = 2,850.63