Finding the Fourth Proportional to 76.48, 105.33 and 72.57

Step by Step Solution

1. Step 1: Write the proportion equation
   76.48 : 105.33 = 72.57 : x
2. Step 2: Convert to fraction form
   76.48/105.33 = 72.57/x
3. Step 3: Cross multiply
   76.48x = 105.33 × 72.57
4. Step 4: Simplify right side
   76.48x = 7,642.91
5. Step 5: Solve for x
   x = 7,642.91/76.48
6. Step 6: Final answer
   x = 99.94