Finding the Fourth Proportional to 2,162.36, 3,240.72 and 991.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,162.36 : 3,240.72 = 991.94 : x
2. Step 2: Convert to fraction form
   2,162.36/3,240.72 = 991.94/x
3. Step 3: Cross multiply
   2,162.36x = 3,240.72 × 991.94
4. Step 4: Simplify right side
   2,162.36x = 3,214,599.80
5. Step 5: Solve for x
   x = 3,214,599.80/2,162.36
6. Step 6: Final answer
   x = 1,486.62