Finding the Fourth Proportional to 111.18, 153.39 and 71.83

Step by Step Solution

1. Step 1: Write the proportion equation
   111.18 : 153.39 = 71.83 : x
2. Step 2: Convert to fraction form
   111.18/153.39 = 71.83/x
3. Step 3: Cross multiply
   111.18x = 153.39 × 71.83
4. Step 4: Simplify right side
   111.18x = 11,018.00
5. Step 5: Solve for x
   x = 11,018.00/111.18
6. Step 6: Final answer
   x = 99.10