Finding the Fourth Proportional to 1,490.48, 2,056.89 and 818.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.48 : 2,056.89 = 818.31 : x
2. Step 2: Convert to fraction form
   1,490.48/2,056.89 = 818.31/x
3. Step 3: Cross multiply
   1,490.48x = 2,056.89 × 818.31
4. Step 4: Simplify right side
   1,490.48x = 1,683,173.66
5. Step 5: Solve for x
   x = 1,683,173.66/1,490.48
6. Step 6: Final answer
   x = 1,129.28