Finding the Fourth Proportional to 72.69, 109.17 and 45.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72.69 : 109.17 = 45.69 : x
2. Step 2: Convert to fraction form
   72.69/109.17 = 45.69/x
3. Step 3: Cross multiply
   72.69x = 109.17 × 45.69
4. Step 4: Simplify right side
   72.69x = 4,987.98
5. Step 5: Solve for x
   x = 4,987.98/72.69
6. Step 6: Final answer
   x = 68.62