Finding the Fourth Proportional to 1,103.24, 1,653.71 and 810.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.24 : 1,653.71 = 810.31 : x
2. Step 2: Convert to fraction form
   1,103.24/1,653.71 = 810.31/x
3. Step 3: Cross multiply
   1,103.24x = 1,653.71 × 810.31
4. Step 4: Simplify right side
   1,103.24x = 1,340,005.43
5. Step 5: Solve for x
   x = 1,340,005.43/1,103.24
6. Step 6: Final answer
   x = 1,214.61