Finding the Fourth Proportional to 71.69, 99 and 56.09

Step by Step Solution

1. Step 1: Write the proportion equation
   71.69 : 99 = 56.09 : x
2. Step 2: Convert to fraction form
   71.69/99 = 56.09/x
3. Step 3: Cross multiply
   71.69x = 99 × 56.09
4. Step 4: Simplify right side
   71.69x = 5,552.91
5. Step 5: Solve for x
   x = 5,552.91/71.69
6. Step 6: Final answer
   x = 77.46