Finding the Fourth Proportional to 1,108.17, 1,529.82 and 688.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.17 : 1,529.82 = 688.73 : x
2. Step 2: Convert to fraction form
   1,108.17/1,529.82 = 688.73/x
3. Step 3: Cross multiply
   1,108.17x = 1,529.82 × 688.73
4. Step 4: Simplify right side
   1,108.17x = 1,053,625.28
5. Step 5: Solve for x
   x = 1,053,625.28/1,108.17
6. Step 6: Final answer
   x = 950.78