Finding the Fourth Proportional to 2,109.07, 3,163.50 and 810.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.07 : 3,163.50 = 810.46 : x
2. Step 2: Convert to fraction form
   2,109.07/3,163.50 = 810.46/x
3. Step 3: Cross multiply
   2,109.07x = 3,163.50 × 810.46
4. Step 4: Simplify right side
   2,109.07x = 2,563,890.21
5. Step 5: Solve for x
   x = 2,563,890.21/2,109.07
6. Step 6: Final answer
   x = 1,215.65