Finding the Fourth Proportional to 5,665.72, 8,503.99 and 3,478.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,665.72 : 8,503.99 = 3,478.72 : x
2. Step 2: Convert to fraction form
   5,665.72/8,503.99 = 3,478.72/x
3. Step 3: Cross multiply
   5,665.72x = 8,503.99 × 3,478.72
4. Step 4: Simplify right side
   5,665.72x = 29,583,000.09
5. Step 5: Solve for x
   x = 29,583,000.09/5,665.72
6. Step 6: Final answer
   x = 5,221.40