Finding the Fourth Proportional to 9,106.75, 12,567.56 and 5,128.01

Step by Step Solution

1. Step 1: Write the proportion equation
   9,106.75 : 12,567.56 = 5,128.01 : x
2. Step 2: Convert to fraction form
   9,106.75/12,567.56 = 5,128.01/x
3. Step 3: Cross multiply
   9,106.75x = 12,567.56 × 5,128.01
4. Step 4: Simplify right side
   9,106.75x = 64,446,573.36
5. Step 5: Solve for x
   x = 64,446,573.36/9,106.75
6. Step 6: Final answer
   x = 7,076.79