Finding the Fourth Proportional to 2,080.15, 3,118.20 and 1,861.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.15 : 3,118.20 = 1,861.45 : x
2. Step 2: Convert to fraction form
   2,080.15/3,118.20 = 1,861.45/x
3. Step 3: Cross multiply
   2,080.15x = 3,118.20 × 1,861.45
4. Step 4: Simplify right side
   2,080.15x = 5,804,373.39
5. Step 5: Solve for x
   x = 5,804,373.39/2,080.15
6. Step 6: Final answer
   x = 2,790.36