Finding the Third Proportional to 172,139.81 and 372,865.69

Step by Step Solution

1. Step 1: Write the proportion equation
   172,139.81 : 372,865.69 = 372,865.69 : x
2. Step 2: Convert to fraction form
   172,139.81/372,865.69 = 372,865.69/x
3. Step 3: Cross multiply
   172,139.81x = 372,865.69 × 372,865.69
4. Step 4: Simplify right side
   172,139.81x = 139,028,820,914.85
5. Step 5: Solve for x
   x = 139,028,820,914.85/172,139.81
6. Step 6: Final answer
   x = 807,650.59