Finding the Fourth Proportional to 89.78, 123.98 and 73.53

Step by Step Solution

1. Step 1: Write the proportion equation
   89.78 : 123.98 = 73.53 : x
2. Step 2: Convert to fraction form
   89.78/123.98 = 73.53/x
3. Step 3: Cross multiply
   89.78x = 123.98 × 73.53
4. Step 4: Simplify right side
   89.78x = 9,115.88
5. Step 5: Solve for x
   x = 9,115.88/89.78
6. Step 6: Final answer
   x = 101.54