Finding the Fourth Proportional to 2,076.23, 3,112.16 and 905.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,076.23 : 3,112.16 = 905.21 : x
2. Step 2: Convert to fraction form
   2,076.23/3,112.16 = 905.21/x
3. Step 3: Cross multiply
   2,076.23x = 3,112.16 × 905.21
4. Step 4: Simplify right side
   2,076.23x = 2,817,149.94
5. Step 5: Solve for x
   x = 2,817,149.94/2,076.23
6. Step 6: Final answer
   x = 1,356.86