Finding the Fourth Proportional to 2,080.30, 3,123.15 and 1,669.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.30 : 3,123.15 = 1,669.90 : x
2. Step 2: Convert to fraction form
   2,080.30/3,123.15 = 1,669.90/x
3. Step 3: Cross multiply
   2,080.30x = 3,123.15 × 1,669.90
4. Step 4: Simplify right side
   2,080.30x = 5,215,348.19
5. Step 5: Solve for x
   x = 5,215,348.19/2,080.30
6. Step 6: Final answer
   x = 2,507.02