Finding the Fourth Proportional to 10,856.16, 14,980.56 and 6,140.88

Step by Step Solution

1. Step 1: Write the proportion equation
   10,856.16 : 14,980.56 = 6,140.88 : x
2. Step 2: Convert to fraction form
   10,856.16/14,980.56 = 6,140.88/x
3. Step 3: Cross multiply
   10,856.16x = 14,980.56 × 6,140.88
4. Step 4: Simplify right side
   10,856.16x = 91,993,821.29
5. Step 5: Solve for x
   x = 91,993,821.29/10,856.16
6. Step 6: Final answer
   x = 8,473.88