Finding the Fourth Proportional to 10,309.10, 15,439.59 and 7,528.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,309.10 : 15,439.59 = 7,528.89 : x
2. Step 2: Convert to fraction form
   10,309.10/15,439.59 = 7,528.89/x
3. Step 3: Cross multiply
   10,309.10x = 15,439.59 × 7,528.89
4. Step 4: Simplify right side
   10,309.10x = 116,242,974.76
5. Step 5: Solve for x
   x = 116,242,974.76/10,309.10
6. Step 6: Final answer
   x = 11,275.76