Finding the Fourth Proportional to 1,426.16, 2,140.02 and 810.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.16 : 2,140.02 = 810.56 : x
2. Step 2: Convert to fraction form
   1,426.16/2,140.02 = 810.56/x
3. Step 3: Cross multiply
   1,426.16x = 2,140.02 × 810.56
4. Step 4: Simplify right side
   1,426.16x = 1,734,614.61
5. Step 5: Solve for x
   x = 1,734,614.61/1,426.16
6. Step 6: Final answer
   x = 1,216.28