Finding the Third Proportional to 13,640.91 and 30,149.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,640.91 : 30,149.72 = 30,149.72 : x
2. Step 2: Convert to fraction form
   13,640.91/30,149.72 = 30,149.72/x
3. Step 3: Cross multiply
   13,640.91x = 30,149.72 × 30,149.72
4. Step 4: Simplify right side
   13,640.91x = 909,005,540.70
5. Step 5: Solve for x
   x = 909,005,540.70/13,640.91
6. Step 6: Final answer
   x = 66,638.21