Finding the Fourth Proportional to 1,919.04, 2,648.24 and 1,172.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.04 : 2,648.24 = 1,172.88 : x
2. Step 2: Convert to fraction form
   1,919.04/2,648.24 = 1,172.88/x
3. Step 3: Cross multiply
   1,919.04x = 2,648.24 × 1,172.88
4. Step 4: Simplify right side
   1,919.04x = 3,106,067.73
5. Step 5: Solve for x
   x = 3,106,067.73/1,919.04
6. Step 6: Final answer
   x = 1,618.55