Finding the Fourth Proportional to 12,849.48, 17,734.32 and 7,815.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,849.48 : 17,734.32 = 7,815.30 : x
2. Step 2: Convert to fraction form
   12,849.48/17,734.32 = 7,815.30/x
3. Step 3: Cross multiply
   12,849.48x = 17,734.32 × 7,815.30
4. Step 4: Simplify right side
   12,849.48x = 138,599,031.10
5. Step 5: Solve for x
   x = 138,599,031.10/12,849.48
6. Step 6: Final answer
   x = 10,786.35