Finding the Fourth Proportional to 1,078.32, 1,617.20 and 530.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.32 : 1,617.20 = 530.72 : x
2. Step 2: Convert to fraction form
   1,078.32/1,617.20 = 530.72/x
3. Step 3: Cross multiply
   1,078.32x = 1,617.20 × 530.72
4. Step 4: Simplify right side
   1,078.32x = 858,280.38
5. Step 5: Solve for x
   x = 858,280.38/1,078.32
6. Step 6: Final answer
   x = 795.94