Finding the Fourth Proportional to 6,465.79, 8,921.71 and 3,813.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,465.79 : 8,921.71 = 3,813.72 : x
2. Step 2: Convert to fraction form
   6,465.79/8,921.71 = 3,813.72/x
3. Step 3: Cross multiply
   6,465.79x = 8,921.71 × 3,813.72
4. Step 4: Simplify right side
   6,465.79x = 34,024,903.86
5. Step 5: Solve for x
   x = 34,024,903.86/6,465.79
6. Step 6: Final answer
   x = 5,262.30