Finding the Fourth Proportional to 2,162.50, 3,243.64 and 991.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,162.50 : 3,243.64 = 991.82 : x
2. Step 2: Convert to fraction form
   2,162.50/3,243.64 = 991.82/x
3. Step 3: Cross multiply
   2,162.50x = 3,243.64 × 991.82
4. Step 4: Simplify right side
   2,162.50x = 3,217,107.02
5. Step 5: Solve for x
   x = 3,217,107.02/2,162.50
6. Step 6: Final answer
   x = 1,487.68