Finding the Fourth Proportional to 12,835.78, 17,705.73 and 8,856.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,835.78 : 17,705.73 = 8,856.70 : x
2. Step 2: Convert to fraction form
   12,835.78/17,705.73 = 8,856.70/x
3. Step 3: Cross multiply
   12,835.78x = 17,705.73 × 8,856.70
4. Step 4: Simplify right side
   12,835.78x = 156,814,338.89
5. Step 5: Solve for x
   x = 156,814,338.89/12,835.78
6. Step 6: Final answer
   x = 12,216.97