Finding the Fourth Proportional to 1,661.52, 2,292.91 and 905.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.52 : 2,292.91 = 905.30 : x
2. Step 2: Convert to fraction form
   1,661.52/2,292.91 = 905.30/x
3. Step 3: Cross multiply
   1,661.52x = 2,292.91 × 905.30
4. Step 4: Simplify right side
   1,661.52x = 2,075,766.90
5. Step 5: Solve for x
   x = 2,075,766.90/1,661.52
6. Step 6: Final answer
   x = 1,249.32