Finding the Fourth Proportional to 1,986.31, 2,979.52 and 946.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.31 : 2,979.52 = 946.42 : x
2. Step 2: Convert to fraction form
   1,986.31/2,979.52 = 946.42/x
3. Step 3: Cross multiply
   1,986.31x = 2,979.52 × 946.42
4. Step 4: Simplify right side
   1,986.31x = 2,819,867.50
5. Step 5: Solve for x
   x = 2,819,867.50/1,986.31
6. Step 6: Final answer
   x = 1,419.65