Finding the Fourth Proportional to 7,510.86, 11,271.42 and 3,128.40

Step by Step Solution

1. Step 1: Write the proportion equation
   7,510.86 : 11,271.42 = 3,128.40 : x
2. Step 2: Convert to fraction form
   7,510.86/11,271.42 = 3,128.40/x
3. Step 3: Cross multiply
   7,510.86x = 11,271.42 × 3,128.40
4. Step 4: Simplify right side
   7,510.86x = 35,261,510.33
5. Step 5: Solve for x
   x = 35,261,510.33/7,510.86
6. Step 6: Final answer
   x = 4,694.74