Finding the Fourth Proportional to 1,103.17, 1,649.97 and 639.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.17 : 1,649.97 = 639.82 : x
2. Step 2: Convert to fraction form
   1,103.17/1,649.97 = 639.82/x
3. Step 3: Cross multiply
   1,103.17x = 1,649.97 × 639.82
4. Step 4: Simplify right side
   1,103.17x = 1,055,683.81
5. Step 5: Solve for x
   x = 1,055,683.81/1,103.17
6. Step 6: Final answer
   x = 956.95