Finding the Fourth Proportional to 99.95, 137.58 and 89.42

Step by Step Solution

1. Step 1: Write the proportion equation
   99.95 : 137.58 = 89.42 : x
2. Step 2: Convert to fraction form
   99.95/137.58 = 89.42/x
3. Step 3: Cross multiply
   99.95x = 137.58 × 89.42
4. Step 4: Simplify right side
   99.95x = 12,302.40
5. Step 5: Solve for x
   x = 12,302.40/99.95
6. Step 6: Final answer
   x = 123.09