Finding the Fourth Proportional to 105.37, 158.15 and 72.93

Step by Step Solution

1. Step 1: Write the proportion equation
   105.37 : 158.15 = 72.93 : x
2. Step 2: Convert to fraction form
   105.37/158.15 = 72.93/x
3. Step 3: Cross multiply
   105.37x = 158.15 × 72.93
4. Step 4: Simplify right side
   105.37x = 11,534.65
5. Step 5: Solve for x
   x = 11,534.65/105.37
6. Step 6: Final answer
   x = 109.47