Finding the Fourth Proportional to 8,910.72, 13,354.56 and 7,866.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,910.72 : 13,354.56 = 7,866.72 : x
2. Step 2: Convert to fraction form
   8,910.72/13,354.56 = 7,866.72/x
3. Step 3: Cross multiply
   8,910.72x = 13,354.56 × 7,866.72
4. Step 4: Simplify right side
   8,910.72x = 105,056,584.24
5. Step 5: Solve for x
   x = 105,056,584.24/8,910.72
6. Step 6: Final answer
   x = 11,789.91