Finding the Fourth Proportional to 191.99, 288.18 and 100.71

Step by Step Solution

1. Step 1: Write the proportion equation
   191.99 : 288.18 = 100.71 : x
2. Step 2: Convert to fraction form
   191.99/288.18 = 100.71/x
3. Step 3: Cross multiply
   191.99x = 288.18 × 100.71
4. Step 4: Simplify right side
   191.99x = 29,022.61
5. Step 5: Solve for x
   x = 29,022.61/191.99
6. Step 6: Final answer
   x = 151.17