Finding the Fourth Proportional to 1,919.59, 2,648.25 and 1,173.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.59 : 2,648.25 = 1,173.25 : x
2. Step 2: Convert to fraction form
   1,919.59/2,648.25 = 1,173.25/x
3. Step 3: Cross multiply
   1,919.59x = 2,648.25 × 1,173.25
4. Step 4: Simplify right side
   1,919.59x = 3,107,059.31
5. Step 5: Solve for x
   x = 3,107,059.31/1,919.59
6. Step 6: Final answer
   x = 1,618.61