Finding the Fourth Proportional to 1,490.31, 2,057.36 and 1,020.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.31 : 2,057.36 = 1,020.69 : x
2. Step 2: Convert to fraction form
   1,490.31/2,057.36 = 1,020.69/x
3. Step 3: Cross multiply
   1,490.31x = 2,057.36 × 1,020.69
4. Step 4: Simplify right side
   1,490.31x = 2,099,921.67
5. Step 5: Solve for x
   x = 2,099,921.67/1,490.31
6. Step 6: Final answer
   x = 1,409.05