Finding the Fourth Proportional to 78.83, 108.80 and 54.26

Step by Step Solution

1. Step 1: Write the proportion equation
   78.83 : 108.80 = 54.26 : x
2. Step 2: Convert to fraction form
   78.83/108.80 = 54.26/x
3. Step 3: Cross multiply
   78.83x = 108.80 × 54.26
4. Step 4: Simplify right side
   78.83x = 5,902.67
5. Step 5: Solve for x
   x = 5,902.67/78.83
6. Step 6: Final answer
   x = 74.88