Finding the Fourth Proportional to 191.94, 288.42 and 100.72

Step by Step Solution

1. Step 1: Write the proportion equation
   191.94 : 288.42 = 100.72 : x
2. Step 2: Convert to fraction form
   191.94/288.42 = 100.72/x
3. Step 3: Cross multiply
   191.94x = 288.42 × 100.72
4. Step 4: Simplify right side
   191.94x = 29,049.66
5. Step 5: Solve for x
   x = 29,049.66/191.94
6. Step 6: Final answer
   x = 151.35