Finding the Fourth Proportional to 105.91, 157.78 and 100.74

Step by Step Solution

1. Step 1: Write the proportion equation
   105.91 : 157.78 = 100.74 : x
2. Step 2: Convert to fraction form
   105.91/157.78 = 100.74/x
3. Step 3: Cross multiply
   105.91x = 157.78 × 100.74
4. Step 4: Simplify right side
   105.91x = 15,895.47
5. Step 5: Solve for x
   x = 15,895.47/105.91
6. Step 6: Final answer
   x = 150.09