Finding the Fourth Proportional to 1,421.10, 1,960.47 and 995.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.10 : 1,960.47 = 995.72 : x
2. Step 2: Convert to fraction form
   1,421.10/1,960.47 = 995.72/x
3. Step 3: Cross multiply
   1,421.10x = 1,960.47 × 995.72
4. Step 4: Simplify right side
   1,421.10x = 1,952,069.39
5. Step 5: Solve for x
   x = 1,952,069.39/1,421.10
6. Step 6: Final answer
   x = 1,373.63