Finding the Third Proportional to 745,421 and 993,139

Step by Step Solution

1. Step 1: Write the proportion equation
   745,421 : 993,139 = 993,139 : x
2. Step 2: Convert to fraction form
   745,421/993,139 = 993,139/x
3. Step 3: Cross multiply
   745,421x = 993,139 × 993,139
4. Step 4: Simplify right side
   745,421x = 986,325,073,321
5. Step 5: Solve for x
   x = 986,325,073,321/745,421
6. Step 6: Final answer
   x = 1,323,178.54