Finding the Fourth Proportional to 72.82, 100.53 and 55.36

Step by Step Solution

1. Step 1: Write the proportion equation
   72.82 : 100.53 = 55.36 : x
2. Step 2: Convert to fraction form
   72.82/100.53 = 55.36/x
3. Step 3: Cross multiply
   72.82x = 100.53 × 55.36
4. Step 4: Simplify right side
   72.82x = 5,565.34
5. Step 5: Solve for x
   x = 5,565.34/72.82
6. Step 6: Final answer
   x = 76.43