Finding the Fourth Proportional to 2,106.83, 2,907.43 and 1,223.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.83 : 2,907.43 = 1,223.15 : x
2. Step 2: Convert to fraction form
   2,106.83/2,907.43 = 1,223.15/x
3. Step 3: Cross multiply
   2,106.83x = 2,907.43 × 1,223.15
4. Step 4: Simplify right side
   2,106.83x = 3,556,223.00
5. Step 5: Solve for x
   x = 3,556,223.00/2,106.83
6. Step 6: Final answer
   x = 1,687.95