Finding the Fourth Proportional to 1,290.84, 1,782.71 and 897.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.84 : 1,782.71 = 897.18 : x
2. Step 2: Convert to fraction form
   1,290.84/1,782.71 = 897.18/x
3. Step 3: Cross multiply
   1,290.84x = 1,782.71 × 897.18
4. Step 4: Simplify right side
   1,290.84x = 1,599,407.27
5. Step 5: Solve for x
   x = 1,599,407.27/1,290.84
6. Step 6: Final answer
   x = 1,239.04