Finding the Fourth Proportional to 2,106.69, 3,156.39 and 1,638.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.69 : 3,156.39 = 1,638.32 : x
2. Step 2: Convert to fraction form
   2,106.69/3,156.39 = 1,638.32/x
3. Step 3: Cross multiply
   2,106.69x = 3,156.39 × 1,638.32
4. Step 4: Simplify right side
   2,106.69x = 5,171,161.08
5. Step 5: Solve for x
   x = 5,171,161.08/2,106.69
6. Step 6: Final answer
   x = 2,454.64