Finding the Fourth Proportional to 91.06, 136.72 and 59.20

Step by Step Solution

1. Step 1: Write the proportion equation
   91.06 : 136.72 = 59.20 : x
2. Step 2: Convert to fraction form
   91.06/136.72 = 59.20/x
3. Step 3: Cross multiply
   91.06x = 136.72 × 59.20
4. Step 4: Simplify right side
   91.06x = 8,093.56
5. Step 5: Solve for x
   x = 8,093.56/91.06
6. Step 6: Final answer
   x = 88.88