Finding the Fourth Proportional to 1,638.53, 2,439.27 and 1,628.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.53 : 2,439.27 = 1,628.81 : x
2. Step 2: Convert to fraction form
   1,638.53/2,439.27 = 1,628.81/x
3. Step 3: Cross multiply
   1,638.53x = 2,439.27 × 1,628.81
4. Step 4: Simplify right side
   1,638.53x = 3,973,095.17
5. Step 5: Solve for x
   x = 3,973,095.17/1,638.53
6. Step 6: Final answer
   x = 2,424.79