Finding the Third Proportional to 51,990 and 80,467.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,990 : 80,467.50 = 80,467.50 : x
2. Step 2: Convert to fraction form
   51,990/80,467.50 = 80,467.50/x
3. Step 3: Cross multiply
   51,990x = 80,467.50 × 80,467.50
4. Step 4: Simplify right side
   51,990x = 6,475,018,556.25
5. Step 5: Solve for x
   x = 6,475,018,556.25/51,990
6. Step 6: Final answer
   x = 124,543.54