Finding the Fourth Proportional to 78.50, 108.27 and 70.71

Step by Step Solution

1. Step 1: Write the proportion equation
   78.50 : 108.27 = 70.71 : x
2. Step 2: Convert to fraction form
   78.50/108.27 = 70.71/x
3. Step 3: Cross multiply
   78.50x = 108.27 × 70.71
4. Step 4: Simplify right side
   78.50x = 7,655.77
5. Step 5: Solve for x
   x = 7,655.77/78.50
6. Step 6: Final answer
   x = 97.53