Finding the Fourth Proportional to 89.34, 123.12 and 83.40

Step by Step Solution

1. Step 1: Write the proportion equation
   89.34 : 123.12 = 83.40 : x
2. Step 2: Convert to fraction form
   89.34/123.12 = 83.40/x
3. Step 3: Cross multiply
   89.34x = 123.12 × 83.40
4. Step 4: Simplify right side
   89.34x = 10,268.21
5. Step 5: Solve for x
   x = 10,268.21/89.34
6. Step 6: Final answer
   x = 114.93