Finding the Fourth Proportional to 78.32, 108.24 and 55.10

Step by Step Solution

1. Step 1: Write the proportion equation
   78.32 : 108.24 = 55.10 : x
2. Step 2: Convert to fraction form
   78.32/108.24 = 55.10/x
3. Step 3: Cross multiply
   78.32x = 108.24 × 55.10
4. Step 4: Simplify right side
   78.32x = 5,964.02
5. Step 5: Solve for x
   x = 5,964.02/78.32
6. Step 6: Final answer
   x = 76.15