Finding the Fourth Proportional to 6,415.72, 8,854.42 and 3,621

Step by Step Solution

1. Step 1: Write the proportion equation
   6,415.72 : 8,854.42 = 3,621 : x
2. Step 2: Convert to fraction form
   6,415.72/8,854.42 = 3,621/x
3. Step 3: Cross multiply
   6,415.72x = 8,854.42 × 3,621
4. Step 4: Simplify right side
   6,415.72x = 32,061,854.82
5. Step 5: Solve for x
   x = 32,061,854.82/6,415.72
6. Step 6: Final answer
   x = 4,997.39