Finding the Fourth Proportional to 1,406.41, 1,939.98 and 986.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.41 : 1,939.98 = 986.15 : x
2. Step 2: Convert to fraction form
   1,406.41/1,939.98 = 986.15/x
3. Step 3: Cross multiply
   1,406.41x = 1,939.98 × 986.15
4. Step 4: Simplify right side
   1,406.41x = 1,913,119.83
5. Step 5: Solve for x
   x = 1,913,119.83/1,406.41
6. Step 6: Final answer
   x = 1,360.29