Finding the Fourth Proportional to 191.84, 287.69 and 89.10

Step by Step Solution

1. Step 1: Write the proportion equation
   191.84 : 287.69 = 89.10 : x
2. Step 2: Convert to fraction form
   191.84/287.69 = 89.10/x
3. Step 3: Cross multiply
   191.84x = 287.69 × 89.10
4. Step 4: Simplify right side
   191.84x = 25,632.73
5. Step 5: Solve for x
   x = 25,632.73/191.84
6. Step 6: Final answer
   x = 133.62