Finding the Fourth Proportional to 1,426.40, 1,968.56 and 836.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.40 : 1,968.56 = 836.64 : x
2. Step 2: Convert to fraction form
   1,426.40/1,968.56 = 836.64/x
3. Step 3: Cross multiply
   1,426.40x = 1,968.56 × 836.64
4. Step 4: Simplify right side
   1,426.40x = 1,646,976.04
5. Step 5: Solve for x
   x = 1,646,976.04/1,426.40
6. Step 6: Final answer
   x = 1,154.64