Finding the Fourth Proportional to 1,485.98, 2,223.79 and 900.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.98 : 2,223.79 = 900.65 : x
2. Step 2: Convert to fraction form
   1,485.98/2,223.79 = 900.65/x
3. Step 3: Cross multiply
   1,485.98x = 2,223.79 × 900.65
4. Step 4: Simplify right side
   1,485.98x = 2,002,859.77
5. Step 5: Solve for x
   x = 2,002,859.77/1,485.98
6. Step 6: Final answer
   x = 1,347.84