Finding the Third Proportional to 208,135.50 and 431,040

Step by Step Solution

1. Step 1: Write the proportion equation
   208,135.50 : 431,040 = 431,040 : x
2. Step 2: Convert to fraction form
   208,135.50/431,040 = 431,040/x
3. Step 3: Cross multiply
   208,135.50x = 431,040 × 431,040
4. Step 4: Simplify right side
   208,135.50x = 185,795,481,600
5. Step 5: Solve for x
   x = 185,795,481,600/208,135.50
6. Step 6: Final answer
   x = 892,665.99