Finding the Fourth Proportional to 99.96, 137.82 and 78.36

Step by Step Solution

1. Step 1: Write the proportion equation
   99.96 : 137.82 = 78.36 : x
2. Step 2: Convert to fraction form
   99.96/137.82 = 78.36/x
3. Step 3: Cross multiply
   99.96x = 137.82 × 78.36
4. Step 4: Simplify right side
   99.96x = 10,799.58
5. Step 5: Solve for x
   x = 10,799.58/99.96
6. Step 6: Final answer
   x = 108.04