Finding the Fourth Proportional to 1,919.58, 2,648.43 and 1,172.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.58 : 2,648.43 = 1,172.74 : x
2. Step 2: Convert to fraction form
   1,919.58/2,648.43 = 1,172.74/x
3. Step 3: Cross multiply
   1,919.58x = 2,648.43 × 1,172.74
4. Step 4: Simplify right side
   1,919.58x = 3,105,919.80
5. Step 5: Solve for x
   x = 3,105,919.80/1,919.58
6. Step 6: Final answer
   x = 1,618.02