Finding the Fourth Proportional to 6,209.76, 8,572.29 and 4,085.38

Step by Step Solution

1. Step 1: Write the proportion equation
   6,209.76 : 8,572.29 = 4,085.38 : x
2. Step 2: Convert to fraction form
   6,209.76/8,572.29 = 4,085.38/x
3. Step 3: Cross multiply
   6,209.76x = 8,572.29 × 4,085.38
4. Step 4: Simplify right side
   6,209.76x = 35,021,036.30
5. Step 5: Solve for x
   x = 35,021,036.30/6,209.76
6. Step 6: Final answer
   x = 5,639.68