Finding the Fourth Proportional to 77.58, 116.22 and 48.72

Step by Step Solution

1. Step 1: Write the proportion equation
   77.58 : 116.22 = 48.72 : x
2. Step 2: Convert to fraction form
   77.58/116.22 = 48.72/x
3. Step 3: Cross multiply
   77.58x = 116.22 × 48.72
4. Step 4: Simplify right side
   77.58x = 5,662.24
5. Step 5: Solve for x
   x = 5,662.24/77.58
6. Step 6: Final answer
   x = 72.99