Finding the Fourth Proportional to 89.53, 123.56 and 50.72

Step by Step Solution

1. Step 1: Write the proportion equation
   89.53 : 123.56 = 50.72 : x
2. Step 2: Convert to fraction form
   89.53/123.56 = 50.72/x
3. Step 3: Cross multiply
   89.53x = 123.56 × 50.72
4. Step 4: Simplify right side
   89.53x = 6,266.56
5. Step 5: Solve for x
   x = 6,266.56/89.53
6. Step 6: Final answer
   x = 69.99