Finding the Fourth Proportional to 12,856.32, 17,832.61 and 12,515.11

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.32 : 17,832.61 = 12,515.11 : x
2. Step 2: Convert to fraction form
   12,856.32/17,832.61 = 12,515.11/x
3. Step 3: Cross multiply
   12,856.32x = 17,832.61 × 12,515.11
4. Step 4: Simplify right side
   12,856.32x = 223,176,976.40
5. Step 5: Solve for x
   x = 223,176,976.40/12,856.32
6. Step 6: Final answer
   x = 17,359.32