Finding the Fourth Proportional to 2,080.74, 2,868.12 and 1,638.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.74 : 2,868.12 = 1,638.06 : x
2. Step 2: Convert to fraction form
   2,080.74/2,868.12 = 1,638.06/x
3. Step 3: Cross multiply
   2,080.74x = 2,868.12 × 1,638.06
4. Step 4: Simplify right side
   2,080.74x = 4,698,152.65
5. Step 5: Solve for x
   x = 4,698,152.65/2,080.74
6. Step 6: Final answer
   x = 2,257.92