Finding the Third Proportional to 555,138 and 1,210,672

Step by Step Solution

1. Step 1: Write the proportion equation
   555,138 : 1,210,672 = 1,210,672 : x
2. Step 2: Convert to fraction form
   555,138/1,210,672 = 1,210,672/x
3. Step 3: Cross multiply
   555,138x = 1,210,672 × 1,210,672
4. Step 4: Simplify right side
   555,138x = 1,465,726,691,584
5. Step 5: Solve for x
   x = 1,465,726,691,584/555,138
6. Step 6: Final answer
   x = 2,640,292.49