Finding the Fourth Proportional to 2,100.30, 3,150.58 and 639.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.30 : 3,150.58 = 639.46 : x
2. Step 2: Convert to fraction form
   2,100.30/3,150.58 = 639.46/x
3. Step 3: Cross multiply
   2,100.30x = 3,150.58 × 639.46
4. Step 4: Simplify right side
   2,100.30x = 2,014,669.89
5. Step 5: Solve for x
   x = 2,014,669.89/2,100.30
6. Step 6: Final answer
   x = 959.23