Finding the Fourth Proportional to 1,426.79, 1,968.95 and 837.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.79 : 1,968.95 = 837.21 : x
2. Step 2: Convert to fraction form
   1,426.79/1,968.95 = 837.21/x
3. Step 3: Cross multiply
   1,426.79x = 1,968.95 × 837.21
4. Step 4: Simplify right side
   1,426.79x = 1,648,410.60
5. Step 5: Solve for x
   x = 1,648,410.60/1,426.79
6. Step 6: Final answer
   x = 1,155.33