Finding the Fourth Proportional to 111.93, 153.50 and 100.98

Step by Step Solution

1. Step 1: Write the proportion equation
   111.93 : 153.50 = 100.98 : x
2. Step 2: Convert to fraction form
   111.93/153.50 = 100.98/x
3. Step 3: Cross multiply
   111.93x = 153.50 × 100.98
4. Step 4: Simplify right side
   111.93x = 15,499.93
5. Step 5: Solve for x
   x = 15,499.93/111.93
6. Step 6: Final answer
   x = 138.48