Finding the Third Proportional to 8,434.13 and 12,904.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,434.13 : 12,904.31 = 12,904.31 : x
2. Step 2: Convert to fraction form
   8,434.13/12,904.31 = 12,904.31/x
3. Step 3: Cross multiply
   8,434.13x = 12,904.31 × 12,904.31
4. Step 4: Simplify right side
   8,434.13x = 166,521,281.10
5. Step 5: Solve for x
   x = 166,521,281.10/8,434.13
6. Step 6: Final answer
   x = 19,743.75