Finding the Fourth Proportional to 109.89, 164.88 and 69.30

Step by Step Solution

1. Step 1: Write the proportion equation
   109.89 : 164.88 = 69.30 : x
2. Step 2: Convert to fraction form
   109.89/164.88 = 69.30/x
3. Step 3: Cross multiply
   109.89x = 164.88 × 69.30
4. Step 4: Simplify right side
   109.89x = 11,426.18
5. Step 5: Solve for x
   x = 11,426.18/109.89
6. Step 6: Final answer
   x = 103.98