Finding the Fourth Proportional to 111.90, 154.42 and 73.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111.90 : 154.42 = 73.10 : x
2. Step 2: Convert to fraction form
   111.90/154.42 = 73.10/x
3. Step 3: Cross multiply
   111.90x = 154.42 × 73.10
4. Step 4: Simplify right side
   111.90x = 11,288.10
5. Step 5: Solve for x
   x = 11,288.10/111.90
6. Step 6: Final answer
   x = 100.88