Finding the Fourth Proportional to 1,287.30, 1,933.32 and 671.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.30 : 1,933.32 = 671.42 : x
2. Step 2: Convert to fraction form
   1,287.30/1,933.32 = 671.42/x
3. Step 3: Cross multiply
   1,287.30x = 1,933.32 × 671.42
4. Step 4: Simplify right side
   1,287.30x = 1,298,069.71
5. Step 5: Solve for x
   x = 1,298,069.71/1,287.30
6. Step 6: Final answer
   x = 1,008.37