Finding the Fourth Proportional to 1,426.16, 1,968 and 836.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.16 : 1,968 = 836.72 : x
2. Step 2: Convert to fraction form
   1,426.16/1,968 = 836.72/x
3. Step 3: Cross multiply
   1,426.16x = 1,968 × 836.72
4. Step 4: Simplify right side
   1,426.16x = 1,646,664.96
5. Step 5: Solve for x
   x = 1,646,664.96/1,426.16
6. Step 6: Final answer
   x = 1,154.61