Finding the Fourth Proportional to 1,287.32, 1,930.34 and 506.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.32 : 1,930.34 = 506.82 : x
2. Step 2: Convert to fraction form
   1,287.32/1,930.34 = 506.82/x
3. Step 3: Cross multiply
   1,287.32x = 1,930.34 × 506.82
4. Step 4: Simplify right side
   1,287.32x = 978,334.92
5. Step 5: Solve for x
   x = 978,334.92/1,287.32
6. Step 6: Final answer
   x = 759.98