Finding the Fourth Proportional to 1,142.33, 1,575.77 and 810.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.33 : 1,575.77 = 810.18 : x
2. Step 2: Convert to fraction form
   1,142.33/1,575.77 = 810.18/x
3. Step 3: Cross multiply
   1,142.33x = 1,575.77 × 810.18
4. Step 4: Simplify right side
   1,142.33x = 1,276,653.29
5. Step 5: Solve for x
   x = 1,276,653.29/1,142.33
6. Step 6: Final answer
   x = 1,117.59