Finding the Fourth Proportional to 2,674.88, 3,690.72 and 1,555.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,674.88 : 3,690.72 = 1,555.20 : x
2. Step 2: Convert to fraction form
   2,674.88/3,690.72 = 1,555.20/x
3. Step 3: Cross multiply
   2,674.88x = 3,690.72 × 1,555.20
4. Step 4: Simplify right side
   2,674.88x = 5,739,807.74
5. Step 5: Solve for x
   x = 5,739,807.74/2,674.88
6. Step 6: Final answer
   x = 2,145.82