Finding the Fourth Proportional to 1,438.43, 1,980.86 and 995.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.43 : 1,980.86 = 995.58 : x
2. Step 2: Convert to fraction form
   1,438.43/1,980.86 = 995.58/x
3. Step 3: Cross multiply
   1,438.43x = 1,980.86 × 995.58
4. Step 4: Simplify right side
   1,438.43x = 1,972,099.62
5. Step 5: Solve for x
   x = 1,972,099.62/1,438.43
6. Step 6: Final answer
   x = 1,371.01