Finding the Fourth Proportional to 2,638.47, 3,959.08 and 1,079.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.47 : 3,959.08 = 1,079.63 : x
2. Step 2: Convert to fraction form
   2,638.47/3,959.08 = 1,079.63/x
3. Step 3: Cross multiply
   2,638.47x = 3,959.08 × 1,079.63
4. Step 4: Simplify right side
   2,638.47x = 4,274,333.89
5. Step 5: Solve for x
   x = 4,274,333.89/2,638.47
6. Step 6: Final answer
   x = 1,620.00