Finding the Third Proportional to 12,640.43 and 28,086.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,640.43 : 28,086.64 = 28,086.64 : x
2. Step 2: Convert to fraction form
   12,640.43/28,086.64 = 28,086.64/x
3. Step 3: Cross multiply
   12,640.43x = 28,086.64 × 28,086.64
4. Step 4: Simplify right side
   12,640.43x = 788,859,601.02
5. Step 5: Solve for x
   x = 788,859,601.02/12,640.43
6. Step 6: Final answer
   x = 62,407.66