Finding the Fourth Proportional to 99.59, 137.46 and 78.93

Step by Step Solution

1. Step 1: Write the proportion equation
   99.59 : 137.46 = 78.93 : x
2. Step 2: Convert to fraction form
   99.59/137.46 = 78.93/x
3. Step 3: Cross multiply
   99.59x = 137.46 × 78.93
4. Step 4: Simplify right side
   99.59x = 10,850.01
5. Step 5: Solve for x
   x = 10,850.01/99.59
6. Step 6: Final answer
   x = 108.95