Finding the Fourth Proportional to 10,572.72, 15,861.60 and 3,647.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,572.72 : 15,861.60 = 3,647.28 : x
2. Step 2: Convert to fraction form
   10,572.72/15,861.60 = 3,647.28/x
3. Step 3: Cross multiply
   10,572.72x = 15,861.60 × 3,647.28
4. Step 4: Simplify right side
   10,572.72x = 57,851,696.45
5. Step 5: Solve for x
   x = 57,851,696.45/10,572.72
6. Step 6: Final answer
   x = 5,471.79