Finding the Fourth Proportional to 1,426.78, 1,968.94 and 837.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.78 : 1,968.94 = 837.21 : x
2. Step 2: Convert to fraction form
   1,426.78/1,968.94 = 837.21/x
3. Step 3: Cross multiply
   1,426.78x = 1,968.94 × 837.21
4. Step 4: Simplify right side
   1,426.78x = 1,648,416.26
5. Step 5: Solve for x
   x = 1,648,416.26/1,426.78
6. Step 6: Final answer
   x = 1,155.34