Finding the Fourth Proportional to 89.37, 123.38 and 56.63

Step by Step Solution

1. Step 1: Write the proportion equation
   89.37 : 123.38 = 56.63 : x
2. Step 2: Convert to fraction form
   89.37/123.38 = 56.63/x
3. Step 3: Cross multiply
   89.37x = 123.38 × 56.63
4. Step 4: Simplify right side
   89.37x = 6,987.01
5. Step 5: Solve for x
   x = 6,987.01/89.37
6. Step 6: Final answer
   x = 78.18