Finding the Fourth Proportional to 1,986.38, 2,978.84 and 890.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.38 : 2,978.84 = 890.18 : x
2. Step 2: Convert to fraction form
   1,986.38/2,978.84 = 890.18/x
3. Step 3: Cross multiply
   1,986.38x = 2,978.84 × 890.18
4. Step 4: Simplify right side
   1,986.38x = 2,651,691.12
5. Step 5: Solve for x
   x = 2,651,691.12/1,986.38
6. Step 6: Final answer
   x = 1,334.94