Finding the Fourth Proportional to 111.43, 152.80 and 100.48

Step by Step Solution

1. Step 1: Write the proportion equation
   111.43 : 152.80 = 100.48 : x
2. Step 2: Convert to fraction form
   111.43/152.80 = 100.48/x
3. Step 3: Cross multiply
   111.43x = 152.80 × 100.48
4. Step 4: Simplify right side
   111.43x = 15,353.34
5. Step 5: Solve for x
   x = 15,353.34/111.43
6. Step 6: Final answer
   x = 137.78