Finding the Fourth Proportional to 2,118.08, 2,922.94 and 1,221.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.08 : 2,922.94 = 1,221.82 : x
2. Step 2: Convert to fraction form
   2,118.08/2,922.94 = 1,221.82/x
3. Step 3: Cross multiply
   2,118.08x = 2,922.94 × 1,221.82
4. Step 4: Simplify right side
   2,118.08x = 3,571,306.55
5. Step 5: Solve for x
   x = 3,571,306.55/2,118.08
6. Step 6: Final answer
   x = 1,686.11