Finding the Fourth Proportional to 1,921.68, 2,650.76 and 1,455.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.68 : 2,650.76 = 1,455.12 : x
2. Step 2: Convert to fraction form
   1,921.68/2,650.76 = 1,455.12/x
3. Step 3: Cross multiply
   1,921.68x = 2,650.76 × 1,455.12
4. Step 4: Simplify right side
   1,921.68x = 3,857,173.89
5. Step 5: Solve for x
   x = 3,857,173.89/1,921.68
6. Step 6: Final answer
   x = 2,007.19