Finding the Fourth Proportional to 111.31, 153.61 and 61.52

Step by Step Solution

1. Step 1: Write the proportion equation
   111.31 : 153.61 = 61.52 : x
2. Step 2: Convert to fraction form
   111.31/153.61 = 61.52/x
3. Step 3: Cross multiply
   111.31x = 153.61 × 61.52
4. Step 4: Simplify right side
   111.31x = 9,449.40
5. Step 5: Solve for x
   x = 9,449.40/111.31
6. Step 6: Final answer
   x = 84.89