Finding the Fourth Proportional to 2,026.18, 3,038.83 and 639.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,026.18 : 3,038.83 = 639.62 : x
2. Step 2: Convert to fraction form
   2,026.18/3,038.83 = 639.62/x
3. Step 3: Cross multiply
   2,026.18x = 3,038.83 × 639.62
4. Step 4: Simplify right side
   2,026.18x = 1,943,700.49
5. Step 5: Solve for x
   x = 1,943,700.49/2,026.18
6. Step 6: Final answer
   x = 959.29