Finding the Fourth Proportional to 1,053.25, 1,578.91 and 662.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.25 : 1,578.91 = 662.06 : x
2. Step 2: Convert to fraction form
   1,053.25/1,578.91 = 662.06/x
3. Step 3: Cross multiply
   1,053.25x = 1,578.91 × 662.06
4. Step 4: Simplify right side
   1,053.25x = 1,045,338.55
5. Step 5: Solve for x
   x = 1,045,338.55/1,053.25
6. Step 6: Final answer
   x = 992.49