Finding the Fourth Proportional to 6,931.96, 9,565.72 and 3,947.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,931.96 : 9,565.72 = 3,947.78 : x
2. Step 2: Convert to fraction form
   6,931.96/9,565.72 = 3,947.78/x
3. Step 3: Cross multiply
   6,931.96x = 9,565.72 × 3,947.78
4. Step 4: Simplify right side
   6,931.96x = 37,763,358.10
5. Step 5: Solve for x
   x = 37,763,358.10/6,931.96
6. Step 6: Final answer
   x = 5,447.72