Finding the Fourth Proportional to 6,665.81, 9,195.77 and 3,870.77

Step by Step Solution

1. Step 1: Write the proportion equation
   6,665.81 : 9,195.77 = 3,870.77 : x
2. Step 2: Convert to fraction form
   6,665.81/9,195.77 = 3,870.77/x
3. Step 3: Cross multiply
   6,665.81x = 9,195.77 × 3,870.77
4. Step 4: Simplify right side
   6,665.81x = 35,594,691.29
5. Step 5: Solve for x
   x = 35,594,691.29/6,665.81
6. Step 6: Final answer
   x = 5,339.89