Finding the Fourth Proportional to 2,640.63, 3,961.23 and 909.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.63 : 3,961.23 = 909.27 : x
2. Step 2: Convert to fraction form
   2,640.63/3,961.23 = 909.27/x
3. Step 3: Cross multiply
   2,640.63x = 3,961.23 × 909.27
4. Step 4: Simplify right side
   2,640.63x = 3,601,827.60
5. Step 5: Solve for x
   x = 3,601,827.60/2,640.63
6. Step 6: Final answer
   x = 1,364.00