Finding the Fourth Proportional to 76.20, 105.06 and 72.52

Step by Step Solution

1. Step 1: Write the proportion equation
   76.20 : 105.06 = 72.52 : x
2. Step 2: Convert to fraction form
   76.20/105.06 = 72.52/x
3. Step 3: Cross multiply
   76.20x = 105.06 × 72.52
4. Step 4: Simplify right side
   76.20x = 7,618.95
5. Step 5: Solve for x
   x = 7,618.95/76.20
6. Step 6: Final answer
   x = 99.99