Finding the Fourth Proportional to 10,628.55, 15,935.99 and 5,081.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,628.55 : 15,935.99 = 5,081.78 : x
2. Step 2: Convert to fraction form
   10,628.55/15,935.99 = 5,081.78/x
3. Step 3: Cross multiply
   10,628.55x = 15,935.99 × 5,081.78
4. Step 4: Simplify right side
   10,628.55x = 80,983,090.17
5. Step 5: Solve for x
   x = 80,983,090.17/10,628.55
6. Step 6: Final answer
   x = 7,619.39