Finding the Fourth Proportional to 78.71, 118.23 and 78.37

Step by Step Solution

1. Step 1: Write the proportion equation
   78.71 : 118.23 = 78.37 : x
2. Step 2: Convert to fraction form
   78.71/118.23 = 78.37/x
3. Step 3: Cross multiply
   78.71x = 118.23 × 78.37
4. Step 4: Simplify right side
   78.71x = 9,265.76
5. Step 5: Solve for x
   x = 9,265.76/78.71
6. Step 6: Final answer
   x = 117.72