Finding the Fourth Proportional to 7,015.91, 9,681.91 and 3,872.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,015.91 : 9,681.91 = 3,872.10 : x
2. Step 2: Convert to fraction form
   7,015.91/9,681.91 = 3,872.10/x
3. Step 3: Cross multiply
   7,015.91x = 9,681.91 × 3,872.10
4. Step 4: Simplify right side
   7,015.91x = 37,489,323.71
5. Step 5: Solve for x
   x = 37,489,323.71/7,015.91
6. Step 6: Final answer
   x = 5,343.47