Finding the Fourth Proportional to 109.60, 164.32 and 82.72

Step by Step Solution

1. Step 1: Write the proportion equation
   109.60 : 164.32 = 82.72 : x
2. Step 2: Convert to fraction form
   109.60/164.32 = 82.72/x
3. Step 3: Cross multiply
   109.60x = 164.32 × 82.72
4. Step 4: Simplify right side
   109.60x = 13,592.55
5. Step 5: Solve for x
   x = 13,592.55/109.60
6. Step 6: Final answer
   x = 124.02