Finding the Fourth Proportional to 61.72, 91.79 and 61.24

Step by Step Solution

1. Step 1: Write the proportion equation
   61.72 : 91.79 = 61.24 : x
2. Step 2: Convert to fraction form
   61.72/91.79 = 61.24/x
3. Step 3: Cross multiply
   61.72x = 91.79 × 61.24
4. Step 4: Simplify right side
   61.72x = 5,621.22
5. Step 5: Solve for x
   x = 5,621.22/61.72
6. Step 6: Final answer
   x = 91.08