Finding the Fourth Proportional to 6,385.71, 8,812.61 and 3,553.09

Step by Step Solution

1. Step 1: Write the proportion equation
   6,385.71 : 8,812.61 = 3,553.09 : x
2. Step 2: Convert to fraction form
   6,385.71/8,812.61 = 3,553.09/x
3. Step 3: Cross multiply
   6,385.71x = 8,812.61 × 3,553.09
4. Step 4: Simplify right side
   6,385.71x = 31,311,996.46
5. Step 5: Solve for x
   x = 31,311,996.46/6,385.71
6. Step 6: Final answer
   x = 4,903.45