Finding the Fourth Proportional to 8,713.42, 12,024.56 and 5,128.51

Step by Step Solution

1. Step 1: Write the proportion equation
   8,713.42 : 12,024.56 = 5,128.51 : x
2. Step 2: Convert to fraction form
   8,713.42/12,024.56 = 5,128.51/x
3. Step 3: Cross multiply
   8,713.42x = 12,024.56 × 5,128.51
4. Step 4: Simplify right side
   8,713.42x = 61,668,076.21
5. Step 5: Solve for x
   x = 61,668,076.21/8,713.42
6. Step 6: Final answer
   x = 7,077.37