Finding the Fourth Proportional to 1,734.01, 2,601.24 and 639.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,734.01 : 2,601.24 = 639.15 : x
2. Step 2: Convert to fraction form
   1,734.01/2,601.24 = 639.15/x
3. Step 3: Cross multiply
   1,734.01x = 2,601.24 × 639.15
4. Step 4: Simplify right side
   1,734.01x = 1,662,582.55
5. Step 5: Solve for x
   x = 1,662,582.55/1,734.01
6. Step 6: Final answer
   x = 958.81