Finding the Fourth Proportional to 2,168.64, 2,991.56 and 1,284.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.64 : 2,991.56 = 1,284.30 : x
2. Step 2: Convert to fraction form
   2,168.64/2,991.56 = 1,284.30/x
3. Step 3: Cross multiply
   2,168.64x = 2,991.56 × 1,284.30
4. Step 4: Simplify right side
   2,168.64x = 3,842,054.09
5. Step 5: Solve for x
   x = 3,842,054.09/2,168.64
6. Step 6: Final answer
   x = 1,771.64