Finding the Fourth Proportional to 911.82, 1,258.32 and 497.82

Step by Step Solution

1. Step 1: Write the proportion equation
   911.82 : 1,258.32 = 497.82 : x
2. Step 2: Convert to fraction form
   911.82/1,258.32 = 497.82/x
3. Step 3: Cross multiply
   911.82x = 1,258.32 × 497.82
4. Step 4: Simplify right side
   911.82x = 626,414.37
5. Step 5: Solve for x
   x = 626,414.37/911.82
6. Step 6: Final answer
   x = 686.99