Finding the Third Proportional to 208,129.50 and 431,028

Step by Step Solution

1. Step 1: Write the proportion equation
   208,129.50 : 431,028 = 431,028 : x
2. Step 2: Convert to fraction form
   208,129.50/431,028 = 431,028/x
3. Step 3: Cross multiply
   208,129.50x = 431,028 × 431,028
4. Step 4: Simplify right side
   208,129.50x = 185,785,136,784
5. Step 5: Solve for x
   x = 185,785,136,784/208,129.50
6. Step 6: Final answer
   x = 892,642.02