Finding the Fourth Proportional to 78.72, 118.10 and 49.74

Step by Step Solution

1. Step 1: Write the proportion equation
   78.72 : 118.10 = 49.74 : x
2. Step 2: Convert to fraction form
   78.72/118.10 = 49.74/x
3. Step 3: Cross multiply
   78.72x = 118.10 × 49.74
4. Step 4: Simplify right side
   78.72x = 5,874.29
5. Step 5: Solve for x
   x = 5,874.29/78.72
6. Step 6: Final answer
   x = 74.62