Finding the Third Proportional to 139,757.50 and 215,074

Step by Step Solution

1. Step 1: Write the proportion equation
   139,757.50 : 215,074 = 215,074 : x
2. Step 2: Convert to fraction form
   139,757.50/215,074 = 215,074/x
3. Step 3: Cross multiply
   139,757.50x = 215,074 × 215,074
4. Step 4: Simplify right side
   139,757.50x = 46,256,825,476
5. Step 5: Solve for x
   x = 46,256,825,476/139,757.50
6. Step 6: Final answer
   x = 330,979.20