Finding the Fourth Proportional to 1,053.27, 1,578.69 and 687.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.27 : 1,578.69 = 687.42 : x
2. Step 2: Convert to fraction form
   1,053.27/1,578.69 = 687.42/x
3. Step 3: Cross multiply
   1,053.27x = 1,578.69 × 687.42
4. Step 4: Simplify right side
   1,053.27x = 1,085,223.08
5. Step 5: Solve for x
   x = 1,085,223.08/1,053.27
6. Step 6: Final answer
   x = 1,030.34