Finding the Fourth Proportional to 93.08, 128.32 and 78.50

Step by Step Solution

1. Step 1: Write the proportion equation
   93.08 : 128.32 = 78.50 : x
2. Step 2: Convert to fraction form
   93.08/128.32 = 78.50/x
3. Step 3: Cross multiply
   93.08x = 128.32 × 78.50
4. Step 4: Simplify right side
   93.08x = 10,072.28
5. Step 5: Solve for x
   x = 10,072.28/93.08
6. Step 6: Final answer
   x = 108.22