Finding the Fourth Proportional to 115.61, 159.53 and 65.82

Step by Step Solution

1. Step 1: Write the proportion equation
   115.61 : 159.53 = 65.82 : x
2. Step 2: Convert to fraction form
   115.61/159.53 = 65.82/x
3. Step 3: Cross multiply
   115.61x = 159.53 × 65.82
4. Step 4: Simplify right side
   115.61x = 10,499.58
5. Step 5: Solve for x
   x = 10,499.58/115.61
6. Step 6: Final answer
   x = 90.82