Finding the Fourth Proportional to 1,077.73, 1,616.82 and 638.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.73 : 1,616.82 = 638.82 : x
2. Step 2: Convert to fraction form
   1,077.73/1,616.82 = 638.82/x
3. Step 3: Cross multiply
   1,077.73x = 1,616.82 × 638.82
4. Step 4: Simplify right side
   1,077.73x = 1,032,856.95
5. Step 5: Solve for x
   x = 1,032,856.95/1,077.73
6. Step 6: Final answer
   x = 958.36