Finding the Fourth Proportional to 1,986.15, 2,978.46 and 945.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.15 : 2,978.46 = 945.35 : x
2. Step 2: Convert to fraction form
   1,986.15/2,978.46 = 945.35/x
3. Step 3: Cross multiply
   1,986.15x = 2,978.46 × 945.35
4. Step 4: Simplify right side
   1,986.15x = 2,815,687.16
5. Step 5: Solve for x
   x = 2,815,687.16/1,986.15
6. Step 6: Final answer
   x = 1,417.66