Finding the Fourth Proportional to 1,077.93, 1,615.37 and 639.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.93 : 1,615.37 = 639.27 : x
2. Step 2: Convert to fraction form
   1,077.93/1,615.37 = 639.27/x
3. Step 3: Cross multiply
   1,077.93x = 1,615.37 × 639.27
4. Step 4: Simplify right side
   1,077.93x = 1,032,654.38
5. Step 5: Solve for x
   x = 1,032,654.38/1,077.93
6. Step 6: Final answer
   x = 958.00