Finding the Fourth Proportional to 78.18, 118.01 and 78.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78.18 : 118.01 = 78.18 : x
2. Step 2: Convert to fraction form
   78.18/118.01 = 78.18/x
3. Step 3: Cross multiply
   78.18x = 118.01 × 78.18
4. Step 4: Simplify right side
   78.18x = 9,225.63
5. Step 5: Solve for x
   x = 9,225.63/78.18
6. Step 6: Final answer
   x = 118.01