Finding the Third Proportional to 8,561.85 and 13,434.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,561.85 : 13,434.40 = 13,434.40 : x
2. Step 2: Convert to fraction form
   8,561.85/13,434.40 = 13,434.40/x
3. Step 3: Cross multiply
   8,561.85x = 13,434.40 × 13,434.40
4. Step 4: Simplify right side
   8,561.85x = 180,483,061.38
5. Step 5: Solve for x
   x = 180,483,061.38/8,561.85
6. Step 6: Final answer
   x = 21,079.92