Finding the Fourth Proportional to 78.79, 118.00 and 67.09

Step by Step Solution

1. Step 1: Write the proportion equation
   78.79 : 118.00 = 67.09 : x
2. Step 2: Convert to fraction form
   78.79/118.00 = 67.09/x
3. Step 3: Cross multiply
   78.79x = 118.00 × 67.09
4. Step 4: Simplify right side
   78.79x = 7,916.28
5. Step 5: Solve for x
   x = 7,916.28/78.79
6. Step 6: Final answer
   x = 100.48