Finding the Fourth Proportional to 2,118.89, 2,922.23 and 1,279.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.89 : 2,922.23 = 1,279.40 : x
2. Step 2: Convert to fraction form
   2,118.89/2,922.23 = 1,279.40/x
3. Step 3: Cross multiply
   2,118.89x = 2,922.23 × 1,279.40
4. Step 4: Simplify right side
   2,118.89x = 3,738,689.65
5. Step 5: Solve for x
   x = 3,738,689.65/2,118.89
6. Step 6: Final answer
   x = 1,764.45