Finding the Fourth Proportional to 111.84, 167.72 and 73.20

Step by Step Solution

1. Step 1: Write the proportion equation
   111.84 : 167.72 = 73.20 : x
2. Step 2: Convert to fraction form
   111.84/167.72 = 73.20/x
3. Step 3: Cross multiply
   111.84x = 167.72 × 73.20
4. Step 4: Simplify right side
   111.84x = 12,277.10
5. Step 5: Solve for x
   x = 12,277.10/111.84
6. Step 6: Final answer
   x = 109.77