Finding the Fourth Proportional to 118.37, 177.59 and 57.50

Step by Step Solution

1. Step 1: Write the proportion equation
   118.37 : 177.59 = 57.50 : x
2. Step 2: Convert to fraction form
   118.37/177.59 = 57.50/x
3. Step 3: Cross multiply
   118.37x = 177.59 × 57.50
4. Step 4: Simplify right side
   118.37x = 10,211.43
5. Step 5: Solve for x
   x = 10,211.43/118.37
6. Step 6: Final answer
   x = 86.27