Finding the Fourth Proportional to 89.29, 123.20 and 56.53

Step by Step Solution

1. Step 1: Write the proportion equation
   89.29 : 123.20 = 56.53 : x
2. Step 2: Convert to fraction form
   89.29/123.20 = 56.53/x
3. Step 3: Cross multiply
   89.29x = 123.20 × 56.53
4. Step 4: Simplify right side
   89.29x = 6,963.88
5. Step 5: Solve for x
   x = 6,963.88/89.29
6. Step 6: Final answer
   x = 77.99