Finding the Fourth Proportional to 1,088.82, 1,635.30 and 678.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.82 : 1,635.30 = 678.72 : x
2. Step 2: Convert to fraction form
   1,088.82/1,635.30 = 678.72/x
3. Step 3: Cross multiply
   1,088.82x = 1,635.30 × 678.72
4. Step 4: Simplify right side
   1,088.82x = 1,109,910.82
5. Step 5: Solve for x
   x = 1,109,910.82/1,088.82
6. Step 6: Final answer
   x = 1,019.37