Finding the Third Proportional to 140,128.50 and 210,336

Step by Step Solution

1. Step 1: Write the proportion equation
   140,128.50 : 210,336 = 210,336 : x
2. Step 2: Convert to fraction form
   140,128.50/210,336 = 210,336/x
3. Step 3: Cross multiply
   140,128.50x = 210,336 × 210,336
4. Step 4: Simplify right side
   140,128.50x = 44,241,232,896
5. Step 5: Solve for x
   x = 44,241,232,896/140,128.50
6. Step 6: Final answer
   x = 315,719.02