Finding the Fourth Proportional to 114.42, 171.69 and 78.58

Step by Step Solution

1. Step 1: Write the proportion equation
   114.42 : 171.69 = 78.58 : x
2. Step 2: Convert to fraction form
   114.42/171.69 = 78.58/x
3. Step 3: Cross multiply
   114.42x = 171.69 × 78.58
4. Step 4: Simplify right side
   114.42x = 13,491.40
5. Step 5: Solve for x
   x = 13,491.40/114.42
6. Step 6: Final answer
   x = 117.91