Finding the Fourth Proportional to 78.86, 118.18 and 46.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78.86 : 118.18 = 46.30 : x
2. Step 2: Convert to fraction form
   78.86/118.18 = 46.30/x
3. Step 3: Cross multiply
   78.86x = 118.18 × 46.30
4. Step 4: Simplify right side
   78.86x = 5,470.91
5. Step 5: Solve for x
   x = 5,470.91/78.86
6. Step 6: Final answer
   x = 69.38