Finding the Fourth Proportional to 7,685.63, 10,604.28 and 5,128.36

Step by Step Solution

1. Step 1: Write the proportion equation
   7,685.63 : 10,604.28 = 5,128.36 : x
2. Step 2: Convert to fraction form
   7,685.63/10,604.28 = 5,128.36/x
3. Step 3: Cross multiply
   7,685.63x = 10,604.28 × 5,128.36
4. Step 4: Simplify right side
   7,685.63x = 54,382,538.22
5. Step 5: Solve for x
   x = 54,382,538.22/7,685.63
6. Step 6: Final answer
   x = 7,075.88