Finding the Fourth Proportional to 89.31, 123.83 and 84.45

Step by Step Solution

1. Step 1: Write the proportion equation
   89.31 : 123.83 = 84.45 : x
2. Step 2: Convert to fraction form
   89.31/123.83 = 84.45/x
3. Step 3: Cross multiply
   89.31x = 123.83 × 84.45
4. Step 4: Simplify right side
   89.31x = 10,457.23
5. Step 5: Solve for x
   x = 10,457.23/89.31
6. Step 6: Final answer
   x = 117.09