Finding the Fourth Proportional to 12,856.01, 17,736.06 and 8,378.13

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.01 : 17,736.06 = 8,378.13 : x
2. Step 2: Convert to fraction form
   12,856.01/17,736.06 = 8,378.13/x
3. Step 3: Cross multiply
   12,856.01x = 17,736.06 × 8,378.13
4. Step 4: Simplify right side
   12,856.01x = 148,595,016.37
5. Step 5: Solve for x
   x = 148,595,016.37/12,856.01
6. Step 6: Final answer
   x = 11,558.41