Finding the Fourth Proportional to 78.43, 117.69 and 30.35

Step by Step Solution

1. Step 1: Write the proportion equation
   78.43 : 117.69 = 30.35 : x
2. Step 2: Convert to fraction form
   78.43/117.69 = 30.35/x
3. Step 3: Cross multiply
   78.43x = 117.69 × 30.35
4. Step 4: Simplify right side
   78.43x = 3,571.89
5. Step 5: Solve for x
   x = 3,571.89/78.43
6. Step 6: Final answer
   x = 45.54