Finding the Fourth Proportional to 1,651.90, 2,279.57 and 905.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,651.90 : 2,279.57 = 905.81 : x
2. Step 2: Convert to fraction form
   1,651.90/2,279.57 = 905.81/x
3. Step 3: Cross multiply
   1,651.90x = 2,279.57 × 905.81
4. Step 4: Simplify right side
   1,651.90x = 2,064,857.30
5. Step 5: Solve for x
   x = 2,064,857.30/1,651.90
6. Step 6: Final answer
   x = 1,249.99