Finding the Fourth Proportional to 2,080.07, 2,870.06 and 1,217.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.07 : 2,870.06 = 1,217.55 : x
2. Step 2: Convert to fraction form
   2,080.07/2,870.06 = 1,217.55/x
3. Step 3: Cross multiply
   2,080.07x = 2,870.06 × 1,217.55
4. Step 4: Simplify right side
   2,080.07x = 3,494,435.47
5. Step 5: Solve for x
   x = 3,494,435.47/2,080.07
6. Step 6: Final answer
   x = 1,679.96