Finding the Fourth Proportional to 1,986.69, 2,978.17 and 946.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.69 : 2,978.17 = 946.15 : x
2. Step 2: Convert to fraction form
   1,986.69/2,978.17 = 946.15/x
3. Step 3: Cross multiply
   1,986.69x = 2,978.17 × 946.15
4. Step 4: Simplify right side
   1,986.69x = 2,817,785.73
5. Step 5: Solve for x
   x = 2,817,785.73/1,986.69
6. Step 6: Final answer
   x = 1,418.33