Finding the Third Proportional to 30,548.81 and 65,129.91

Step by Step Solution

1. Step 1: Write the proportion equation
   30,548.81 : 65,129.91 = 65,129.91 : x
2. Step 2: Convert to fraction form
   30,548.81/65,129.91 = 65,129.91/x
3. Step 3: Cross multiply
   30,548.81x = 65,129.91 × 65,129.91
4. Step 4: Simplify right side
   30,548.81x = 4,241,904,688.13
5. Step 5: Solve for x
   x = 4,241,904,688.13/30,548.81
6. Step 6: Final answer
   x = 138,856.61