Finding the Fourth Proportional to 72.96, 109.49 and 45.87

Step by Step Solution

1. Step 1: Write the proportion equation
   72.96 : 109.49 = 45.87 : x
2. Step 2: Convert to fraction form
   72.96/109.49 = 45.87/x
3. Step 3: Cross multiply
   72.96x = 109.49 × 45.87
4. Step 4: Simplify right side
   72.96x = 5,022.08
5. Step 5: Solve for x
   x = 5,022.08/72.96
6. Step 6: Final answer
   x = 68.83