Finding the Fourth Proportional to 12,826.83, 17,708.37 and 9,778.01

Step by Step Solution

1. Step 1: Write the proportion equation
   12,826.83 : 17,708.37 = 9,778.01 : x
2. Step 2: Convert to fraction form
   12,826.83/17,708.37 = 9,778.01/x
3. Step 3: Cross multiply
   12,826.83x = 17,708.37 × 9,778.01
4. Step 4: Simplify right side
   12,826.83x = 173,152,618.94
5. Step 5: Solve for x
   x = 173,152,618.94/12,826.83
6. Step 6: Final answer
   x = 13,499.25