Finding the Fourth Proportional to 2,190.79, 3,020.11 and 1,665.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,190.79 : 3,020.11 = 1,665.91 : x
2. Step 2: Convert to fraction form
   2,190.79/3,020.11 = 1,665.91/x
3. Step 3: Cross multiply
   2,190.79x = 3,020.11 × 1,665.91
4. Step 4: Simplify right side
   2,190.79x = 5,031,231.45
5. Step 5: Solve for x
   x = 5,031,231.45/2,190.79
6. Step 6: Final answer
   x = 2,296.54