Finding the Fourth Proportional to 191.91, 287.91 and 100.59

Step by Step Solution

1. Step 1: Write the proportion equation
   191.91 : 287.91 = 100.59 : x
2. Step 2: Convert to fraction form
   191.91/287.91 = 100.59/x
3. Step 3: Cross multiply
   191.91x = 287.91 × 100.59
4. Step 4: Simplify right side
   191.91x = 28,959.79
5. Step 5: Solve for x
   x = 28,959.79/191.91
6. Step 6: Final answer
   x = 150.90