Finding the Fourth Proportional to 78.82, 108.72 and 66.52

Step by Step Solution

1. Step 1: Write the proportion equation
   78.82 : 108.72 = 66.52 : x
2. Step 2: Convert to fraction form
   78.82/108.72 = 66.52/x
3. Step 3: Cross multiply
   78.82x = 108.72 × 66.52
4. Step 4: Simplify right side
   78.82x = 7,232.05
5. Step 5: Solve for x
   x = 7,232.05/78.82
6. Step 6: Final answer
   x = 91.75