Finding the Fourth Proportional to 6,139.71, 8,471.34 and 3,621.63

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.71 : 8,471.34 = 3,621.63 : x
2. Step 2: Convert to fraction form
   6,139.71/8,471.34 = 3,621.63/x
3. Step 3: Cross multiply
   6,139.71x = 8,471.34 × 3,621.63
4. Step 4: Simplify right side
   6,139.71x = 30,680,059.08
5. Step 5: Solve for x
   x = 30,680,059.08/6,139.71
6. Step 6: Final answer
   x = 4,996.99