Finding the Fourth Proportional to 2,805.05, 3,870.38 and 1,920.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,805.05 : 3,870.38 = 1,920.53 : x
2. Step 2: Convert to fraction form
   2,805.05/3,870.38 = 1,920.53/x
3. Step 3: Cross multiply
   2,805.05x = 3,870.38 × 1,920.53
4. Step 4: Simplify right side
   2,805.05x = 7,433,166.35
5. Step 5: Solve for x
   x = 7,433,166.35/2,805.05
6. Step 6: Final answer
   x = 2,649.93