Finding the Fourth Proportional to 78.93, 108.35 and 71.98

Step by Step Solution

1. Step 1: Write the proportion equation
   78.93 : 108.35 = 71.98 : x
2. Step 2: Convert to fraction form
   78.93/108.35 = 71.98/x
3. Step 3: Cross multiply
   78.93x = 108.35 × 71.98
4. Step 4: Simplify right side
   78.93x = 7,799.03
5. Step 5: Solve for x
   x = 7,799.03/78.93
6. Step 6: Final answer
   x = 98.81