Finding the Fourth Proportional to 102.94, 142.18 and 91.33

Step by Step Solution

1. Step 1: Write the proportion equation
   102.94 : 142.18 = 91.33 : x
2. Step 2: Convert to fraction form
   102.94/142.18 = 91.33/x
3. Step 3: Cross multiply
   102.94x = 142.18 × 91.33
4. Step 4: Simplify right side
   102.94x = 12,984.72
5. Step 5: Solve for x
   x = 12,984.72/102.94
6. Step 6: Final answer
   x = 126.14