Finding the Third Proportional to 12,856 and 19,421.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856 : 19,421.50 = 19,421.50 : x
2. Step 2: Convert to fraction form
   12,856/19,421.50 = 19,421.50/x
3. Step 3: Cross multiply
   12,856x = 19,421.50 × 19,421.50
4. Step 4: Simplify right side
   12,856x = 377,194,662.25
5. Step 5: Solve for x
   x = 377,194,662.25/12,856
6. Step 6: Final answer
   x = 29,339.97