Finding the Fourth Proportional to 71.62, 98.72 and 59.20

Step by Step Solution

1. Step 1: Write the proportion equation
   71.62 : 98.72 = 59.20 : x
2. Step 2: Convert to fraction form
   71.62/98.72 = 59.20/x
3. Step 3: Cross multiply
   71.62x = 98.72 × 59.20
4. Step 4: Simplify right side
   71.62x = 5,844.22
5. Step 5: Solve for x
   x = 5,844.22/71.62
6. Step 6: Final answer
   x = 81.60