Finding the Third Proportional to 213,079.50 and 355,089

Step by Step Solution

1. Step 1: Write the proportion equation
   213,079.50 : 355,089 = 355,089 : x
2. Step 2: Convert to fraction form
   213,079.50/355,089 = 355,089/x
3. Step 3: Cross multiply
   213,079.50x = 355,089 × 355,089
4. Step 4: Simplify right side
   213,079.50x = 126,088,197,921
5. Step 5: Solve for x
   x = 126,088,197,921/213,079.50
6. Step 6: Final answer
   x = 591,742.51