Finding the Fourth Proportional to 1,456.74, 2,008.35 and 990.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,456.74 : 2,008.35 = 990.18 : x
2. Step 2: Convert to fraction form
   1,456.74/2,008.35 = 990.18/x
3. Step 3: Cross multiply
   1,456.74x = 2,008.35 × 990.18
4. Step 4: Simplify right side
   1,456.74x = 1,988,628.00
5. Step 5: Solve for x
   x = 1,988,628.00/1,456.74
6. Step 6: Final answer
   x = 1,365.12