Finding the Fourth Proportional to 2,106.79, 3,156.42 and 1,284.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.79 : 3,156.42 = 1,284.64 : x
2. Step 2: Convert to fraction form
   2,106.79/3,156.42 = 1,284.64/x
3. Step 3: Cross multiply
   2,106.79x = 3,156.42 × 1,284.64
4. Step 4: Simplify right side
   2,106.79x = 4,054,863.39
5. Step 5: Solve for x
   x = 4,054,863.39/2,106.79
6. Step 6: Final answer
   x = 1,924.66