Finding the Fourth Proportional to 118.55, 177.83 and 57.72

Step by Step Solution

1. Step 1: Write the proportion equation
   118.55 : 177.83 = 57.72 : x
2. Step 2: Convert to fraction form
   118.55/177.83 = 57.72/x
3. Step 3: Cross multiply
   118.55x = 177.83 × 57.72
4. Step 4: Simplify right side
   118.55x = 10,264.06
5. Step 5: Solve for x
   x = 10,264.06/118.55
6. Step 6: Final answer
   x = 86.58