Finding the Fourth Proportional to 78.96, 108.83 and 72.08

Step by Step Solution

1. Step 1: Write the proportion equation
   78.96 : 108.83 = 72.08 : x
2. Step 2: Convert to fraction form
   78.96/108.83 = 72.08/x
3. Step 3: Cross multiply
   78.96x = 108.83 × 72.08
4. Step 4: Simplify right side
   78.96x = 7,844.10
5. Step 5: Solve for x
   x = 7,844.10/78.96
6. Step 6: Final answer
   x = 99.34