Finding the Fourth Proportional to 78.88, 118.10 and 59.71

Step by Step Solution

1. Step 1: Write the proportion equation
   78.88 : 118.10 = 59.71 : x
2. Step 2: Convert to fraction form
   78.88/118.10 = 59.71/x
3. Step 3: Cross multiply
   78.88x = 118.10 × 59.71
4. Step 4: Simplify right side
   78.88x = 7,051.45
5. Step 5: Solve for x
   x = 7,051.45/78.88
6. Step 6: Final answer
   x = 89.39