Finding the Third Proportional to 145,139.75 and 213,441.88

Step by Step Solution

1. Step 1: Write the proportion equation
   145,139.75 : 213,441.88 = 213,441.88 : x
2. Step 2: Convert to fraction form
   145,139.75/213,441.88 = 213,441.88/x
3. Step 3: Cross multiply
   145,139.75x = 213,441.88 × 213,441.88
4. Step 4: Simplify right side
   145,139.75x = 45,557,434,003.52
5. Step 5: Solve for x
   x = 45,557,434,003.52/145,139.75
6. Step 6: Final answer
   x = 313,886.68