Finding the Fourth Proportional to 1,490.67, 2,057.16 and 818.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.67 : 2,057.16 = 818.50 : x
2. Step 2: Convert to fraction form
   1,490.67/2,057.16 = 818.50/x
3. Step 3: Cross multiply
   1,490.67x = 2,057.16 × 818.50
4. Step 4: Simplify right side
   1,490.67x = 1,683,785.46
5. Step 5: Solve for x
   x = 1,683,785.46/1,490.67
6. Step 6: Final answer
   x = 1,129.55