Finding the Fourth Proportional to 1,426.82, 2,140.43 and 646.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.82 : 2,140.43 = 646.81 : x
2. Step 2: Convert to fraction form
   1,426.82/2,140.43 = 646.81/x
3. Step 3: Cross multiply
   1,426.82x = 2,140.43 × 646.81
4. Step 4: Simplify right side
   1,426.82x = 1,384,448.96
5. Step 5: Solve for x
   x = 1,384,448.96/1,426.82
6. Step 6: Final answer
   x = 970.31