Finding the Fourth Proportional to 6,309.34, 8,709.42 and 4,071.40

Step by Step Solution

1. Step 1: Write the proportion equation
   6,309.34 : 8,709.42 = 4,071.40 : x
2. Step 2: Convert to fraction form
   6,309.34/8,709.42 = 4,071.40/x
3. Step 3: Cross multiply
   6,309.34x = 8,709.42 × 4,071.40
4. Step 4: Simplify right side
   6,309.34x = 35,459,532.59
5. Step 5: Solve for x
   x = 35,459,532.59/6,309.34
6. Step 6: Final answer
   x = 5,620.17