Finding the Fourth Proportional to 10,059.80, 15,030.15 and 9,715.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,059.80 : 15,030.15 = 9,715.28 : x
2. Step 2: Convert to fraction form
   10,059.80/15,030.15 = 9,715.28/x
3. Step 3: Cross multiply
   10,059.80x = 15,030.15 × 9,715.28
4. Step 4: Simplify right side
   10,059.80x = 146,022,115.69
5. Step 5: Solve for x
   x = 146,022,115.69/10,059.80
6. Step 6: Final answer
   x = 14,515.41