Finding the Fourth Proportional to 8,477.69, 11,699.59 and 5,640.51

Step by Step Solution

1. Step 1: Write the proportion equation
   8,477.69 : 11,699.59 = 5,640.51 : x
2. Step 2: Convert to fraction form
   8,477.69/11,699.59 = 5,640.51/x
3. Step 3: Cross multiply
   8,477.69x = 11,699.59 × 5,640.51
4. Step 4: Simplify right side
   8,477.69x = 65,991,661.83
5. Step 5: Solve for x
   x = 65,991,661.83/8,477.69
6. Step 6: Final answer
   x = 7,784.16