Finding the Fourth Proportional to 111.56, 153.54 and 100.62

Step by Step Solution

1. Step 1: Write the proportion equation
   111.56 : 153.54 = 100.62 : x
2. Step 2: Convert to fraction form
   111.56/153.54 = 100.62/x
3. Step 3: Cross multiply
   111.56x = 153.54 × 100.62
4. Step 4: Simplify right side
   111.56x = 15,449.19
5. Step 5: Solve for x
   x = 15,449.19/111.56
6. Step 6: Final answer
   x = 138.49