Finding the Fourth Proportional to 2,665.56, 3,991.86 and 2,047.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.56 : 3,991.86 = 2,047.80 : x
2. Step 2: Convert to fraction form
   2,665.56/3,991.86 = 2,047.80/x
3. Step 3: Cross multiply
   2,665.56x = 3,991.86 × 2,047.80
4. Step 4: Simplify right side
   2,665.56x = 8,174,530.91
5. Step 5: Solve for x
   x = 8,174,530.91/2,665.56
6. Step 6: Final answer
   x = 3,066.72