Finding the Fourth Proportional to 1,490.25, 2,056.56 and 818.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.25 : 2,056.56 = 818.07 : x
2. Step 2: Convert to fraction form
   1,490.25/2,056.56 = 818.07/x
3. Step 3: Cross multiply
   1,490.25x = 2,056.56 × 818.07
4. Step 4: Simplify right side
   1,490.25x = 1,682,399.76
5. Step 5: Solve for x
   x = 1,682,399.76/1,490.25
6. Step 6: Final answer
   x = 1,128.94