Finding the Fourth Proportional to 1,095.30, 1,643.34 and 678.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,095.30 : 1,643.34 = 678.33 : x
2. Step 2: Convert to fraction form
   1,095.30/1,643.34 = 678.33/x
3. Step 3: Cross multiply
   1,095.30x = 1,643.34 × 678.33
4. Step 4: Simplify right side
   1,095.30x = 1,114,726.82
5. Step 5: Solve for x
   x = 1,114,726.82/1,095.30
6. Step 6: Final answer
   x = 1,017.74