Finding the Third Proportional to 373,443 and 503,139

Step by Step Solution

1. Step 1: Write the proportion equation
   373,443 : 503,139 = 503,139 : x
2. Step 2: Convert to fraction form
   373,443/503,139 = 503,139/x
3. Step 3: Cross multiply
   373,443x = 503,139 × 503,139
4. Step 4: Simplify right side
   373,443x = 253,148,853,321
5. Step 5: Solve for x
   x = 253,148,853,321/373,443
6. Step 6: Final answer
   x = 677,878.16