Finding the Fourth Proportional to 1,919.94, 2,878.59 and 687.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.94 : 2,878.59 = 687.32 : x
2. Step 2: Convert to fraction form
   1,919.94/2,878.59 = 687.32/x
3. Step 3: Cross multiply
   1,919.94x = 2,878.59 × 687.32
4. Step 4: Simplify right side
   1,919.94x = 1,978,507.59
5. Step 5: Solve for x
   x = 1,978,507.59/1,919.94
6. Step 6: Final answer
   x = 1,030.51