Finding the Fourth Proportional to 2,099.32, 3,149.52 and 638.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.32 : 3,149.52 = 638.62 : x
2. Step 2: Convert to fraction form
   2,099.32/3,149.52 = 638.62/x
3. Step 3: Cross multiply
   2,099.32x = 3,149.52 × 638.62
4. Step 4: Simplify right side
   2,099.32x = 2,011,346.46
5. Step 5: Solve for x
   x = 2,011,346.46/2,099.32
6. Step 6: Final answer
   x = 958.09