Finding the Fourth Proportional to 1,032.41, 1,424.72 and 639.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,032.41 : 1,424.72 = 639.47 : x
2. Step 2: Convert to fraction form
   1,032.41/1,424.72 = 639.47/x
3. Step 3: Cross multiply
   1,032.41x = 1,424.72 × 639.47
4. Step 4: Simplify right side
   1,032.41x = 911,062.50
5. Step 5: Solve for x
   x = 911,062.50/1,032.41
6. Step 6: Final answer
   x = 882.46