Finding the Fourth Proportional to 100.42, 151.25 and 89.12

Step by Step Solution

1. Step 1: Write the proportion equation
   100.42 : 151.25 = 89.12 : x
2. Step 2: Convert to fraction form
   100.42/151.25 = 89.12/x
3. Step 3: Cross multiply
   100.42x = 151.25 × 89.12
4. Step 4: Simplify right side
   100.42x = 13,479.40
5. Step 5: Solve for x
   x = 13,479.40/100.42
6. Step 6: Final answer
   x = 134.23