Finding the Fourth Proportional to 2,118.06, 2,922.93 and 1,290.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.06 : 2,922.93 = 1,290.06 : x
2. Step 2: Convert to fraction form
   2,118.06/2,922.93 = 1,290.06/x
3. Step 3: Cross multiply
   2,118.06x = 2,922.93 × 1,290.06
4. Step 4: Simplify right side
   2,118.06x = 3,770,759.16
5. Step 5: Solve for x
   x = 3,770,759.16/2,118.06
6. Step 6: Final answer
   x = 1,780.29