Finding the Fourth Proportional to 93.56, 128.95 and 78.82

Step by Step Solution

1. Step 1: Write the proportion equation
   93.56 : 128.95 = 78.82 : x
2. Step 2: Convert to fraction form
   93.56/128.95 = 78.82/x
3. Step 3: Cross multiply
   93.56x = 128.95 × 78.82
4. Step 4: Simplify right side
   93.56x = 10,163.32
5. Step 5: Solve for x
   x = 10,163.32/93.56
6. Step 6: Final answer
   x = 108.63