Finding the Fourth Proportional to 69.86, 104.61 and 56.09

Step by Step Solution

1. Step 1: Write the proportion equation
   69.86 : 104.61 = 56.09 : x
2. Step 2: Convert to fraction form
   69.86/104.61 = 56.09/x
3. Step 3: Cross multiply
   69.86x = 104.61 × 56.09
4. Step 4: Simplify right side
   69.86x = 5,867.57
5. Step 5: Solve for x
   x = 5,867.57/69.86
6. Step 6: Final answer
   x = 83.99