Finding the Fourth Proportional to 1,405.10, 1,936.98 and 984.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.10 : 1,936.98 = 984.15 : x
2. Step 2: Convert to fraction form
   1,405.10/1,936.98 = 984.15/x
3. Step 3: Cross multiply
   1,405.10x = 1,936.98 × 984.15
4. Step 4: Simplify right side
   1,405.10x = 1,906,278.87
5. Step 5: Solve for x
   x = 1,906,278.87/1,405.10
6. Step 6: Final answer
   x = 1,356.68