Finding the Fourth Proportional to 10,856.57, 14,980.86 and 6,381.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,856.57 : 14,980.86 = 6,381.72 : x
2. Step 2: Convert to fraction form
   10,856.57/14,980.86 = 6,381.72/x
3. Step 3: Cross multiply
   10,856.57x = 14,980.86 × 6,381.72
4. Step 4: Simplify right side
   10,856.57x = 95,603,653.88
5. Step 5: Solve for x
   x = 95,603,653.88/10,856.57
6. Step 6: Final answer
   x = 8,806.07