Finding the Fourth Proportional to 8,128.89, 11,214.54 and 5,477.16

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.89 : 11,214.54 = 5,477.16 : x
2. Step 2: Convert to fraction form
   8,128.89/11,214.54 = 5,477.16/x
3. Step 3: Cross multiply
   8,128.89x = 11,214.54 × 5,477.16
4. Step 4: Simplify right side
   8,128.89x = 61,423,829.91
5. Step 5: Solve for x
   x = 61,423,829.91/8,128.89
6. Step 6: Final answer
   x = 7,556.24