Finding the Fourth Proportional to 2,051.20, 3,078.02 and 1,921.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,051.20 : 3,078.02 = 1,921.47 : x
2. Step 2: Convert to fraction form
   2,051.20/3,078.02 = 1,921.47/x
3. Step 3: Cross multiply
   2,051.20x = 3,078.02 × 1,921.47
4. Step 4: Simplify right side
   2,051.20x = 5,914,323.09
5. Step 5: Solve for x
   x = 5,914,323.09/2,051.20
6. Step 6: Final answer
   x = 2,883.35