Finding the Fourth Proportional to 2,190.20, 3,280.92 and 1,670.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,190.20 : 3,280.92 = 1,670.72 : x
2. Step 2: Convert to fraction form
   2,190.20/3,280.92 = 1,670.72/x
3. Step 3: Cross multiply
   2,190.20x = 3,280.92 × 1,670.72
4. Step 4: Simplify right side
   2,190.20x = 5,481,498.66
5. Step 5: Solve for x
   x = 5,481,498.66/2,190.20
6. Step 6: Final answer
   x = 2,502.74