Finding the Fourth Proportional to 55.32, 82.72 and 39.99

Step by Step Solution

1. Step 1: Write the proportion equation
   55.32 : 82.72 = 39.99 : x
2. Step 2: Convert to fraction form
   55.32/82.72 = 39.99/x
3. Step 3: Cross multiply
   55.32x = 82.72 × 39.99
4. Step 4: Simplify right side
   55.32x = 3,308.33
5. Step 5: Solve for x
   x = 3,308.33/55.32
6. Step 6: Final answer
   x = 59.81