Finding the Fourth Proportional to 2,760.89, 3,807.96 and 1,921.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,760.89 : 3,807.96 = 1,921.64 : x
2. Step 2: Convert to fraction form
   2,760.89/3,807.96 = 1,921.64/x
3. Step 3: Cross multiply
   2,760.89x = 3,807.96 × 1,921.64
4. Step 4: Simplify right side
   2,760.89x = 7,317,528.25
5. Step 5: Solve for x
   x = 7,317,528.25/2,760.89
6. Step 6: Final answer
   x = 2,650.42