Finding the Fourth Proportional to 111.38, 153.69 and 61.58

Step by Step Solution

1. Step 1: Write the proportion equation
   111.38 : 153.69 = 61.58 : x
2. Step 2: Convert to fraction form
   111.38/153.69 = 61.58/x
3. Step 3: Cross multiply
   111.38x = 153.69 × 61.58
4. Step 4: Simplify right side
   111.38x = 9,464.61
5. Step 5: Solve for x
   x = 9,464.61/111.38
6. Step 6: Final answer
   x = 84.98