Finding the Fourth Proportional to 78.29, 107.71 and 67.89

Step by Step Solution

1. Step 1: Write the proportion equation
   78.29 : 107.71 = 67.89 : x
2. Step 2: Convert to fraction form
   78.29/107.71 = 67.89/x
3. Step 3: Cross multiply
   78.29x = 107.71 × 67.89
4. Step 4: Simplify right side
   78.29x = 7,312.26
5. Step 5: Solve for x
   x = 7,312.26/78.29
6. Step 6: Final answer
   x = 93.41