Finding the Fourth Proportional to 2,106.95, 2,907.50 and 1,222.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.95 : 2,907.50 = 1,222.70 : x
2. Step 2: Convert to fraction form
   2,106.95/2,907.50 = 1,222.70/x
3. Step 3: Cross multiply
   2,106.95x = 2,907.50 × 1,222.70
4. Step 4: Simplify right side
   2,106.95x = 3,554,979.60
5. Step 5: Solve for x
   x = 3,554,979.60/2,106.95
6. Step 6: Final answer
   x = 1,687.27