Finding the Fourth Proportional to 2,080.18, 2,870.88 and 1,555.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.18 : 2,870.88 = 1,555.30 : x
2. Step 2: Convert to fraction form
   2,080.18/2,870.88 = 1,555.30/x
3. Step 3: Cross multiply
   2,080.18x = 2,870.88 × 1,555.30
4. Step 4: Simplify right side
   2,080.18x = 4,465,079.66
5. Step 5: Solve for x
   x = 4,465,079.66/2,080.18
6. Step 6: Final answer
   x = 2,146.49