Finding the Fourth Proportional to 72.69, 109.05 and 45.67

Step by Step Solution

1. Step 1: Write the proportion equation
   72.69 : 109.05 = 45.67 : x
2. Step 2: Convert to fraction form
   72.69/109.05 = 45.67/x
3. Step 3: Cross multiply
   72.69x = 109.05 × 45.67
4. Step 4: Simplify right side
   72.69x = 4,980.31
5. Step 5: Solve for x
   x = 4,980.31/72.69
6. Step 6: Final answer
   x = 68.51