Finding the Fourth Proportional to 1,141.17, 1,574.78 and 810.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.17 : 1,574.78 = 810.15 : x
2. Step 2: Convert to fraction form
   1,141.17/1,574.78 = 810.15/x
3. Step 3: Cross multiply
   1,141.17x = 1,574.78 × 810.15
4. Step 4: Simplify right side
   1,141.17x = 1,275,803.97
5. Step 5: Solve for x
   x = 1,275,803.97/1,141.17
6. Step 6: Final answer
   x = 1,117.98