Finding the Fourth Proportional to 1,155.72, 1,734.17 and 539.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.72 : 1,734.17 = 539.48 : x
2. Step 2: Convert to fraction form
   1,155.72/1,734.17 = 539.48/x
3. Step 3: Cross multiply
   1,155.72x = 1,734.17 × 539.48
4. Step 4: Simplify right side
   1,155.72x = 935,538.66
5. Step 5: Solve for x
   x = 935,538.66/1,155.72
6. Step 6: Final answer
   x = 809.49