Finding the Fourth Proportional to 1,019.29, 1,405.25 and 810.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.29 : 1,405.25 = 810.16 : x
2. Step 2: Convert to fraction form
   1,019.29/1,405.25 = 810.16/x
3. Step 3: Cross multiply
   1,019.29x = 1,405.25 × 810.16
4. Step 4: Simplify right side
   1,019.29x = 1,138,470.31
5. Step 5: Solve for x
   x = 1,138,470.31/1,019.29
6. Step 6: Final answer
   x = 1,116.93