Finding the Fourth Proportional to 78.76, 118.56 and 61.76

Step by Step Solution

1. Step 1: Write the proportion equation
   78.76 : 118.56 = 61.76 : x
2. Step 2: Convert to fraction form
   78.76/118.56 = 61.76/x
3. Step 3: Cross multiply
   78.76x = 118.56 × 61.76
4. Step 4: Simplify right side
   78.76x = 7,322.27
5. Step 5: Solve for x
   x = 7,322.27/78.76
6. Step 6: Final answer
   x = 92.97