Finding the Fourth Proportional to 2,641.76, 3,955.34 and 1,990.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.76 : 3,955.34 = 1,990.52 : x
2. Step 2: Convert to fraction form
   2,641.76/3,955.34 = 1,990.52/x
3. Step 3: Cross multiply
   2,641.76x = 3,955.34 × 1,990.52
4. Step 4: Simplify right side
   2,641.76x = 7,873,183.38
5. Step 5: Solve for x
   x = 7,873,183.38/2,641.76
6. Step 6: Final answer
   x = 2,980.28