Finding the Fourth Proportional to 2,107.05, 2,907.52 and 1,222.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.05 : 2,907.52 = 1,222.77 : x
2. Step 2: Convert to fraction form
   2,107.05/2,907.52 = 1,222.77/x
3. Step 3: Cross multiply
   2,107.05x = 2,907.52 × 1,222.77
4. Step 4: Simplify right side
   2,107.05x = 3,555,218.86
5. Step 5: Solve for x
   x = 3,555,218.86/2,107.05
6. Step 6: Final answer
   x = 1,687.30