Finding the Fourth Proportional to 99.27, 136.94 and 78.57

Step by Step Solution

1. Step 1: Write the proportion equation
   99.27 : 136.94 = 78.57 : x
2. Step 2: Convert to fraction form
   99.27/136.94 = 78.57/x
3. Step 3: Cross multiply
   99.27x = 136.94 × 78.57
4. Step 4: Simplify right side
   99.27x = 10,758.98
5. Step 5: Solve for x
   x = 10,758.98/99.27
6. Step 6: Final answer
   x = 108.38