Finding the Fourth Proportional to 111.63, 154.05 and 72.34

Step by Step Solution

1. Step 1: Write the proportion equation
   111.63 : 154.05 = 72.34 : x
2. Step 2: Convert to fraction form
   111.63/154.05 = 72.34/x
3. Step 3: Cross multiply
   111.63x = 154.05 × 72.34
4. Step 4: Simplify right side
   111.63x = 11,144.59
5. Step 5: Solve for x
   x = 11,144.59/111.63
6. Step 6: Final answer
   x = 99.84