Finding the Fourth Proportional to 1,420.39, 1,958.02 and 999.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.39 : 1,958.02 = 999.37 : x
2. Step 2: Convert to fraction form
   1,420.39/1,958.02 = 999.37/x
3. Step 3: Cross multiply
   1,420.39x = 1,958.02 × 999.37
4. Step 4: Simplify right side
   1,420.39x = 1,956,786.45
5. Step 5: Solve for x
   x = 1,956,786.45/1,420.39
6. Step 6: Final answer
   x = 1,377.64