Finding the Fourth Proportional to 191.98, 287.89 and 100.58

Step by Step Solution

1. Step 1: Write the proportion equation
   191.98 : 287.89 = 100.58 : x
2. Step 2: Convert to fraction form
   191.98/287.89 = 100.58/x
3. Step 3: Cross multiply
   191.98x = 287.89 × 100.58
4. Step 4: Simplify right side
   191.98x = 28,955.98
5. Step 5: Solve for x
   x = 28,955.98/191.98
6. Step 6: Final answer
   x = 150.83