Finding the Fourth Proportional to 6,428.72, 8,871.72 and 3,634.28

Step by Step Solution

1. Step 1: Write the proportion equation
   6,428.72 : 8,871.72 = 3,634.28 : x
2. Step 2: Convert to fraction form
   6,428.72/8,871.72 = 3,634.28/x
3. Step 3: Cross multiply
   6,428.72x = 8,871.72 × 3,634.28
4. Step 4: Simplify right side
   6,428.72x = 32,242,314.56
5. Step 5: Solve for x
   x = 32,242,314.56/6,428.72
6. Step 6: Final answer
   x = 5,015.36