Finding the Fourth Proportional to 111.18, 153.42 and 61.39

Step by Step Solution

1. Step 1: Write the proportion equation
   111.18 : 153.42 = 61.39 : x
2. Step 2: Convert to fraction form
   111.18/153.42 = 61.39/x
3. Step 3: Cross multiply
   111.18x = 153.42 × 61.39
4. Step 4: Simplify right side
   111.18x = 9,417.67
5. Step 5: Solve for x
   x = 9,417.67/111.18
6. Step 6: Final answer
   x = 84.71