Finding the Fourth Proportional to 2,007.13, 3,006.61 and 1,638.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.13 : 3,006.61 = 1,638.25 : x
2. Step 2: Convert to fraction form
   2,007.13/3,006.61 = 1,638.25/x
3. Step 3: Cross multiply
   2,007.13x = 3,006.61 × 1,638.25
4. Step 4: Simplify right side
   2,007.13x = 4,925,578.83
5. Step 5: Solve for x
   x = 4,925,578.83/2,007.13
6. Step 6: Final answer
   x = 2,454.04