Finding the Fourth Proportional to 99.48, 137.33 and 78.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99.48 : 137.33 = 78.83 : x
2. Step 2: Convert to fraction form
   99.48/137.33 = 78.83/x
3. Step 3: Cross multiply
   99.48x = 137.33 × 78.83
4. Step 4: Simplify right side
   99.48x = 10,824.64
5. Step 5: Solve for x
   x = 10,824.64/99.48
6. Step 6: Final answer
   x = 108.81