Finding the Fourth Proportional to 10,428.53, 15,640.05 and 3,856.59

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.53 : 15,640.05 = 3,856.59 : x
2. Step 2: Convert to fraction form
   10,428.53/15,640.05 = 3,856.59/x
3. Step 3: Cross multiply
   10,428.53x = 15,640.05 × 3,856.59
4. Step 4: Simplify right side
   10,428.53x = 60,317,260.43
5. Step 5: Solve for x
   x = 60,317,260.43/10,428.53
6. Step 6: Final answer
   x = 5,783.87