Finding the Fourth Proportional to 93.20, 128.52 and 78.62

Step by Step Solution

1. Step 1: Write the proportion equation
   93.20 : 128.52 = 78.62 : x
2. Step 2: Convert to fraction form
   93.20/128.52 = 78.62/x
3. Step 3: Cross multiply
   93.20x = 128.52 × 78.62
4. Step 4: Simplify right side
   93.20x = 10,103.60
5. Step 5: Solve for x
   x = 10,103.60/93.20
6. Step 6: Final answer
   x = 108.41