Finding the Fourth Proportional to 6,891.71, 9,510.61 and 3,747.89

Step by Step Solution

1. Step 1: Write the proportion equation
   6,891.71 : 9,510.61 = 3,747.89 : x
2. Step 2: Convert to fraction form
   6,891.71/9,510.61 = 3,747.89/x
3. Step 3: Cross multiply
   6,891.71x = 9,510.61 × 3,747.89
4. Step 4: Simplify right side
   6,891.71x = 35,644,720.11
5. Step 5: Solve for x
   x = 35,644,720.11/6,891.71
6. Step 6: Final answer
   x = 5,172.12