Finding the Fourth Proportional to 2,106.81, 2,907.80 and 1,222.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.81 : 2,907.80 = 1,222.59 : x
2. Step 2: Convert to fraction form
   2,106.81/2,907.80 = 1,222.59/x
3. Step 3: Cross multiply
   2,106.81x = 2,907.80 × 1,222.59
4. Step 4: Simplify right side
   2,106.81x = 3,555,056.58
5. Step 5: Solve for x
   x = 3,555,056.58/2,106.81
6. Step 6: Final answer
   x = 1,687.41