Finding the Fourth Proportional to 118.88, 178.37 and 57.98

Step by Step Solution

1. Step 1: Write the proportion equation
   118.88 : 178.37 = 57.98 : x
2. Step 2: Convert to fraction form
   118.88/178.37 = 57.98/x
3. Step 3: Cross multiply
   118.88x = 178.37 × 57.98
4. Step 4: Simplify right side
   118.88x = 10,341.89
5. Step 5: Solve for x
   x = 10,341.89/118.88
6. Step 6: Final answer
   x = 86.99