Finding the Fourth Proportional to 1,077.98, 1,616.02 and 638.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.98 : 1,616.02 = 638.15 : x
2. Step 2: Convert to fraction form
   1,077.98/1,616.02 = 638.15/x
3. Step 3: Cross multiply
   1,077.98x = 1,616.02 × 638.15
4. Step 4: Simplify right side
   1,077.98x = 1,031,265.61
5. Step 5: Solve for x
   x = 1,031,265.61/1,077.98
6. Step 6: Final answer
   x = 956.66