Finding the Fourth Proportional to 12,836.86, 17,709.59 and 7,800.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,836.86 : 17,709.59 = 7,800.28 : x
2. Step 2: Convert to fraction form
   12,836.86/17,709.59 = 7,800.28/x
3. Step 3: Cross multiply
   12,836.86x = 17,709.59 × 7,800.28
4. Step 4: Simplify right side
   12,836.86x = 138,139,735.91
5. Step 5: Solve for x
   x = 138,139,735.91/12,836.86
6. Step 6: Final answer
   x = 10,761.18