Finding the Fourth Proportional to 111.38, 153.59 and 71.99

Step by Step Solution

1. Step 1: Write the proportion equation
   111.38 : 153.59 = 71.99 : x
2. Step 2: Convert to fraction form
   111.38/153.59 = 71.99/x
3. Step 3: Cross multiply
   111.38x = 153.59 × 71.99
4. Step 4: Simplify right side
   111.38x = 11,056.94
5. Step 5: Solve for x
   x = 11,056.94/111.38
6. Step 6: Final answer
   x = 99.27