Finding the Fourth Proportional to 1,426.89, 1,969.20 and 837.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.89 : 1,969.20 = 837.21 : x
2. Step 2: Convert to fraction form
   1,426.89/1,969.20 = 837.21/x
3. Step 3: Cross multiply
   1,426.89x = 1,969.20 × 837.21
4. Step 4: Simplify right side
   1,426.89x = 1,648,633.93
5. Step 5: Solve for x
   x = 1,648,633.93/1,426.89
6. Step 6: Final answer
   x = 1,155.40