Finding the Third Proportional to 31,045.78 and 65,789.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,045.78 : 65,789.72 = 65,789.72 : x
2. Step 2: Convert to fraction form
   31,045.78/65,789.72 = 65,789.72/x
3. Step 3: Cross multiply
   31,045.78x = 65,789.72 × 65,789.72
4. Step 4: Simplify right side
   31,045.78x = 4,328,287,093.20
5. Step 5: Solve for x
   x = 4,328,287,093.20/31,045.78
6. Step 6: Final answer
   x = 139,416.27