Finding the Third Proportional to 172,139.50 and 263,164

Step by Step Solution

1. Step 1: Write the proportion equation
   172,139.50 : 263,164 = 263,164 : x
2. Step 2: Convert to fraction form
   172,139.50/263,164 = 263,164/x
3. Step 3: Cross multiply
   172,139.50x = 263,164 × 263,164
4. Step 4: Simplify right side
   172,139.50x = 69,255,290,896
5. Step 5: Solve for x
   x = 69,255,290,896/172,139.50
6. Step 6: Final answer
   x = 402,320.74