Finding the Fourth Proportional to 1,651.61, 2,279.27 and 905.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,651.61 : 2,279.27 = 905.57 : x
2. Step 2: Convert to fraction form
   1,651.61/2,279.27 = 905.57/x
3. Step 3: Cross multiply
   1,651.61x = 2,279.27 × 905.57
4. Step 4: Simplify right side
   1,651.61x = 2,064,029.40
5. Step 5: Solve for x
   x = 2,064,029.40/1,651.61
6. Step 6: Final answer
   x = 1,249.71