Finding the Fourth Proportional to 89.61, 123.74 and 83.46

Step by Step Solution

1. Step 1: Write the proportion equation
   89.61 : 123.74 = 83.46 : x
2. Step 2: Convert to fraction form
   89.61/123.74 = 83.46/x
3. Step 3: Cross multiply
   89.61x = 123.74 × 83.46
4. Step 4: Simplify right side
   89.61x = 10,327.34
5. Step 5: Solve for x
   x = 10,327.34/89.61
6. Step 6: Final answer
   x = 115.25