Finding the Third Proportional to 139,959 and 215,142.75

Step by Step Solution

1. Step 1: Write the proportion equation
   139,959 : 215,142.75 = 215,142.75 : x
2. Step 2: Convert to fraction form
   139,959/215,142.75 = 215,142.75/x
3. Step 3: Cross multiply
   139,959x = 215,142.75 × 215,142.75
4. Step 4: Simplify right side
   139,959x = 46,286,402,877.56
5. Step 5: Solve for x
   x = 46,286,402,877.56/139,959
6. Step 6: Final answer
   x = 330,714.02