Finding the Fourth Proportional to 103.95, 143.06 and 89.37

Step by Step Solution

1. Step 1: Write the proportion equation
   103.95 : 143.06 = 89.37 : x
2. Step 2: Convert to fraction form
   103.95/143.06 = 89.37/x
3. Step 3: Cross multiply
   103.95x = 143.06 × 89.37
4. Step 4: Simplify right side
   103.95x = 12,784.83
5. Step 5: Solve for x
   x = 12,784.83/103.95
6. Step 6: Final answer
   x = 122.99