Finding the Fourth Proportional to 78.88, 118.29 and 30.12

Step by Step Solution

1. Step 1: Write the proportion equation
   78.88 : 118.29 = 30.12 : x
2. Step 2: Convert to fraction form
   78.88/118.29 = 30.12/x
3. Step 3: Cross multiply
   78.88x = 118.29 × 30.12
4. Step 4: Simplify right side
   78.88x = 3,562.89
5. Step 5: Solve for x
   x = 3,562.89/78.88
6. Step 6: Final answer
   x = 45.17