Finding the Fourth Proportional to 72.87, 109.20 and 59.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72.87 : 109.20 = 59.10 : x
2. Step 2: Convert to fraction form
   72.87/109.20 = 59.10/x
3. Step 3: Cross multiply
   72.87x = 109.20 × 59.10
4. Step 4: Simplify right side
   72.87x = 6,453.72
5. Step 5: Solve for x
   x = 6,453.72/72.87
6. Step 6: Final answer
   x = 88.56