Finding the Fourth Proportional to 2,661.02, 3,991.82 and 906.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.02 : 3,991.82 = 906.20 : x
2. Step 2: Convert to fraction form
   2,661.02/3,991.82 = 906.20/x
3. Step 3: Cross multiply
   2,661.02x = 3,991.82 × 906.20
4. Step 4: Simplify right side
   2,661.02x = 3,617,362.79
5. Step 5: Solve for x
   x = 3,617,362.79/2,661.02
6. Step 6: Final answer
   x = 1,359.39