Finding the Fourth Proportional to 3,980.72, 5,490.56 and 2,653.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.72 : 5,490.56 = 2,653.76 : x
2. Step 2: Convert to fraction form
   3,980.72/5,490.56 = 2,653.76/x
3. Step 3: Cross multiply
   3,980.72x = 5,490.56 × 2,653.76
4. Step 4: Simplify right side
   3,980.72x = 14,570,628.51
5. Step 5: Solve for x
   x = 14,570,628.51/3,980.72
6. Step 6: Final answer
   x = 3,660.30