Finding the Fourth Proportional to 118.72, 178.10 and 57.88

Step by Step Solution

1. Step 1: Write the proportion equation
   118.72 : 178.10 = 57.88 : x
2. Step 2: Convert to fraction form
   118.72/178.10 = 57.88/x
3. Step 3: Cross multiply
   118.72x = 178.10 × 57.88
4. Step 4: Simplify right side
   118.72x = 10,307.25
5. Step 5: Solve for x
   x = 10,307.25/118.72
6. Step 6: Final answer
   x = 86.82